44 on july 23 , 2020 , the company sold a land parcel at the circle point property in denver , colorado for $ 6.5 million , resulting in an aggregate gain of $ 1.3 million net of disposal-related costs and taxes paid by our taxable reit subsidiary , which has been classified as net gain on sale of real estate property in the consolidated statements of operations . indebtedness at december 31 , 2020 , we had approximately $ 75.0 million outstanding under the company 's unsecured credit facility ( the “ unsecured credit facility ” ) and a $ 7.0 million letter of credit to satisfy escrow requirements for a mortgage lender . for additional information regarding these mortgage loans , the unsecured credit facility , including the company 's five-year $ 50 million term loan thereunder ( the “ term loan ” ) and the related five-year interest rate swap for a notional amount of $ 50 million to which the company is a party ( the “ interest rate swap ” ) , please refer to “ liquidity and capital resources ” below . revenue base as of december 31 , 2020 , we owned 25 properties comprised of 65 office buildings with a total of approximately 5.8 million square feet of net rentable area ( “ nra ” ) . as of december 31 , 2020 , our properties were approximately 90.5 % leased . office leases historically , most leases for our properties have been on a full-service gross or net lease basis , and we expect to continue to use such leases in the future . a full-service gross lease generally has a base year expense “ stop ” , whereby we pay a stated amount of expenses as part of the rent payment while future increases ( above the base year stop ) in property operating expenses are billed to the tenant based on such tenant 's proportionate square footage in the property . the property operating expenses are reflected in operating expenses ; however , only the increased property operating expenses above the base year stop recovered from tenants are reflected as tenant recoveries in our statements of operations . in a triple net lease , the tenant is typically responsible for all property taxes and operating expenses . as such , the base rent payment does not include any operating expenses , but rather all such expenses are billed to or paid by the tenant . the full amount of the expenses for this lease type is reflected in operating expenses , and the reimbursement is reflected in tenant recoveries . all tenants in the lake vista pointe , 2525 mckinnon , sorrento mesa and canyon park properties have triple net leases . certain tenants at amberglen , superior pointe , florida research park , circle point , the quad , cascade station and denver tech have leases on a triple net basis . we are also a lessor for a fee simple ground lease at the amberglen property . all of our remaining leases are full-service gross leases . factors that may influence our operating results and financial condition covid-19 during the first quarter of 2020 , the world health organization declared the covid-19 outbreak a pandemic . there have been mandates from international , federal , state and local authorities requiring forced closures of businesses and other facilities , and most of the markets in which our buildings are located have been or are subject to some form of pandemic-related restrictions . these forced closures and restrictions have had a material adverse effect on the global economy and the regional u.s. economies in which we operate , including negatively impacting some of our tenants ' ability to pay their rent . all of our buildings are open and continue to operate . we have adopted new policies and procedures to incorporate best practices for the safety of our tenants , our vendors and our employees . however , the usage of 45 our assets in 2020 was significantly lower than normal . usage of our assets in the near future depends on the duration of the pandemic , the implementation of covid-19 vaccines and corporate and individual decisions regarding return to usage of office space , which is impossible to estimate . we continue to closely monitor the impact of the covid-19 pandemic on all aspects of our business and geographies . while we did not experience any significant disruptions during the year ended december 31 , 2020 , as a result of covid-19 or governmental or tenant actions in response thereto , the company granted rent relief to nine tenants comprising approximately 1.1 % of the company 's occupied nra , most often in the form of a rent deferral or rent abatement . subsequent to december 31 , 2020 , the company granted additional rent abatements to four tenants who previously received relief , which combined comprises approximately 0.1 % of the company 's occupied nra and an immaterial amount of rental revenue . although the rent deferrals and rent abatements granted to date did not have a material impact on our rental revenue , the long-term impact of the pandemic on our tenants and the world-wide economy is uncertain and impossible to estimate , and will depend on the scope , severity and duration of the pandemic . we believe that some of the industries most impacted by covid-19 are coworking , retail , restaurant and café , travel and accommodation , live event related and energy . we generally have limited exposure to these industries , with these sectors comprising approximately 3 % of our portfolio by square footage . however , the impact of covid-19 extends to all sectors of the u.s. economy and as such , we expect that tenants outside of these select industries will also face significant challenges . story_separator_special_tag asu 2021-01 clarifies the scope of topic 848 so that derivatives affected by the discounting transition are explicitly eligible for certain optional expedients and exceptions in topic 848. asu 2020-04 and asu 2021-01 can be applied as of the beginning of the interim period that includes march 12 , 2020 , however , the guidance will only be available for optional use through december 31 , 2022. the new standard applies prospectively to contract modifications and hedging relationships and may be elected over time as reference rate reform activities occur . the company has not yet adopted the standard and continues to evaluate the impact of asu 2020-04 and asu 2021-01 on its consolidated financial statements and may elect optional expedients in future periods as reference rate reform activities occur . on april 10 , 2020 , the financial accounting standards board ( the “ fasb ” ) issued a staff q & a to respond to some frequently asked questions about accounting for rent relief related to the effects of the covid-19 pandemic . consequently , for rent relief related to the effects of the covid-19 pandemic , an entity will not be required to analyze each contract to determine whether enforceable rights and obligations for abatements exist in the contract and can elect to apply or not apply the lease modification guidance to those contracts . entities may make the elections for any lessor-provided rent relief related to the effects of the covid-19 pandemic ( e.g . , deferrals of lease payments , reduced future lease payments , etc . ) as long as the rent relief does not result in a substantial increase in the rights of the lessor or the obligations of the lessee . to date , the company granted rent relief to certain tenants , most often in the form of a rent deferral or rent abatement . for rent relief granted that did not result in a substantial increase in the rights of the lessor or the obligations of the lessee , the company elected to not apply the lease modification guidance and instead account for the rent relief as though the enforceable rights and obligations for the relief existed in the original contract . for rent relief granted that resulted in a substantial increase in the rights of the lessor or the obligations of the lessee , the company applied the lease modification guidance to the applicable contracts . results of operations comparison of year ended december 31 , 2020 to year ended december 31 , 2019 rental and other revenues . revenue includes net rental income , including parking , signage and other income , as well as the recovery of operating costs and property taxes from tenants . rental and other revenues increased $ 4.5 million , or 3 % , to $ 160.8 million for the year ended december 31 , 2020 compared to 50 $ 156.3 million for the year ended december 31 , 2019. of this increase , the acquisitions of 7601 tech , cascade station and canyon park contributed increases of $ 4.0 million , $ 1.7 million , and $ 1.3 million , respectively . revenue increased by $ 1.2 million at our dtc crossroads property within the denver tech portfolio and by $ 0.9 million at our sorrento mesa property due to significant leasing transactions during the year , which lifted occupancy and rental income . revenue from the cherry creek property also increased by $ 0.7 million , as it benefited from a lease termination fee payment during the year ended december 31 , 2020. partially offsetting these increases , rental revenue decreased at 190 office center and pima center by $ 0.4 million and $ 0.6 million , respectively , due to a decrease in occupancy during the year ended december 31 , 2020. revenue during the year ended december 31 , 2019 also benefited from a one-time payment of $ 2.6 million received as consideration for the assignment of a purchase contract . the assignment fee originated through our administrative services relationship . revenues during the year ended december 31 , 2020 were further impacted due to the sale of the logan tower property in december 2019 and the plaza 25 property in february 2019 , which decreased overall revenue by $ 1.2 and $ 0.2 million , respectively , for the year ended december 31 , 2020. the remaining properties ' rental and other revenues were relatively unchanged in comparison to the year ended december 31 , 2019. operating expenses total operating expenses . total operating expenses consist of property operating expenses , general and administrative expenses and depreciation and amortization . total operating expenses increased by $ 1.9 million , or 1 % , to $ 129.4 million for the year ended december 31 , 2020 , from $ 127.5 million for the year ended december 31 , 2019. total operating expenses increased by $ 2.8 million , $ 1.2 million and $ 0.8 million , respectively , from the acquisitions of 7601 tech , cascade station and canyon park properties . partially offsetting these increases , total operating expenses decreased by $ 1.2 million , and $ 0.2 million , respectively , due to the sale of the logan tower and plaza 25 properties . operating expenses at our camelback square and 5090 n. 40 th street properties decreased by $ 0.6 million and $ 0.5 million , respectively , due to higher depreciation and amortization expenses as a result of the full depreciation of certain assets during the year ended december 31 , 2019. general and administrative expenses decreased by $ 0.4 million in the year ended december 31 , 2020 primarily due to $ 1.1 million of one-time expenses incurred as a result of the assignment fee income earned during the year ended december 31 , 2019 , which was partially offset by higher payroll and stock-based compensation costs for the year ended december 31 ,

cash flows comparison of period ended december 31 , 2020 to period ended december 31 , 2019 cash , cash equivalents and restricted cash were $ 46.0 million and $ 87.5 million as of december 31 , 2020 and december 31 , 2019 , respectively . cash flow from operating activities . net cash provided by operating activities increased by $ 10.4 million to $ 59.9 million for the year ended december 31 , 2020 compared to $ 49.5 million for the year ended december 31 , 2019. the increase was primarily attributable to increased operating cash flows from acquired properties and changes in working capital . cash flow to investing activities . net cash used in investing activities decreased by $ 54.1 million to $ 27.8 million for the year ended december 31 , 2020 compared to $ 81.9 million for the year ended december 31 , 2019. the decrease in cash used in investing activities was primarily due to no acquisitions of real estate and lower proceeds from the sale of real estate during the year ended december 31 , 2020. cash flow to financing activities . net cash used in financing activities increased by $ 160.5 million to $ 73.7 million for the year ended december 31 , 2020 compared to $ 86.8 million provided by financing activities for the year ended december 31 , 2019. the increase in cash used in financing activities was primarily due to repurchases of our common stock and no proceeds from sale of our common stock for the year ended december 31 , 2020. the increase was partially offset by higher net proceeds from our unsecured credit facility borrowings in 2020 compared to 2019. liquidity and capital resources analysis of liquidity and capital resources we had approximately $ 25.3 million of cash and cash equivalents and $ 20.6 million of restricted cash as of december 31 , 2020 .


 Write a concise suspicious activity report of the following text delimited by triple backquotes. Return your response as a formal report which covers the key points highlighting the location,dates,entity names and account holder information in chronological order of the text.
     ```cash flows comparison of period ended december 31 , 2020 to period ended december 31 , 2019 cash , cash equivalents and restricted cash were $ 46.0 million and $ 87.5 million as of december 31 , 2020 and december 31 , 2019 , respectively . cash flow from operating activities . net cash provided by operating activities increased by $ 10.4 million to $ 59.9 million for the year ended december 31 , 2020 compared to $ 49.5 million for the year ended december 31 , 2019. the increase was primarily attributable to increased operating cash flows from acquired properties and changes in working capital . cash flow to investing activities . net cash used in investing activities decreased by $ 54.1 million to $ 27.8 million for the year ended december 31 , 2020 compared to $ 81.9 million for the year ended december 31 , 2019. the decrease in cash used in investing activities was primarily due to no acquisitions of real estate and lower proceeds from the sale of real estate during the year ended december 31 , 2020. cash flow to financing activities . net cash used in financing activities increased by $ 160.5 million to $ 73.7 million for the year ended december 31 , 2020 compared to $ 86.8 million provided by financing activities for the year ended december 31 , 2019. the increase in cash used in financing activities was primarily due to repurchases of our common stock and no proceeds from sale of our common stock for the year ended december 31 , 2020. the increase was partially offset by higher net proceeds from our unsecured credit facility borrowings in 2020 compared to 2019. liquidity and capital resources analysis of liquidity and capital resources we had approximately $ 25.3 million of cash and cash equivalents and $ 20.6 million of restricted cash as of december 31 , 2020 .
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 Suspicious Activity Report : 44 on july 23 , 2020 , the company sold a land parcel at the circle point property in denver , colorado for $ 6.5 million , resulting in an aggregate gain of $ 1.3 million net of disposal-related costs and taxes paid by our taxable reit subsidiary , which has been classified as net gain on sale of real estate property in the consolidated statements of operations . indebtedness at december 31 , 2020 , we had approximately $ 75.0 million outstanding under the company 's unsecured credit facility ( the “ unsecured credit facility ” ) and a $ 7.0 million letter of credit to satisfy escrow requirements for a mortgage lender . for additional information regarding these mortgage loans , the unsecured credit facility , including the company 's five-year $ 50 million term loan thereunder ( the “ term loan ” ) and the related five-year interest rate swap for a notional amount of $ 50 million to which the company is a party ( the “ interest rate swap ” ) , please refer to “ liquidity and capital resources ” below . revenue base as of december 31 , 2020 , we owned 25 properties comprised of 65 office buildings with a total of approximately 5.8 million square feet of net rentable area ( “ nra ” ) . as of december 31 , 2020 , our properties were approximately 90.5 % leased . office leases historically , most leases for our properties have been on a full-service gross or net lease basis , and we expect to continue to use such leases in the future . a full-service gross lease generally has a base year expense “ stop ” , whereby we pay a stated amount of expenses as part of the rent payment while future increases ( above the base year stop ) in property operating expenses are billed to the tenant based on such tenant 's proportionate square footage in the property . the property operating expenses are reflected in operating expenses ; however , only the increased property operating expenses above the base year stop recovered from tenants are reflected as tenant recoveries in our statements of operations . in a triple net lease , the tenant is typically responsible for all property taxes and operating expenses . as such , the base rent payment does not include any operating expenses , but rather all such expenses are billed to or paid by the tenant . the full amount of the expenses for this lease type is reflected in operating expenses , and the reimbursement is reflected in tenant recoveries . all tenants in the lake vista pointe , 2525 mckinnon , sorrento mesa and canyon park properties have triple net leases . certain tenants at amberglen , superior pointe , florida research park , circle point , the quad , cascade station and denver tech have leases on a triple net basis . we are also a lessor for a fee simple ground lease at the amberglen property . all of our remaining leases are full-service gross leases . factors that may influence our operating results and financial condition covid-19 during the first quarter of 2020 , the world health organization declared the covid-19 outbreak a pandemic . there have been mandates from international , federal , state and local authorities requiring forced closures of businesses and other facilities , and most of the markets in which our buildings are located have been or are subject to some form of pandemic-related restrictions . these forced closures and restrictions have had a material adverse effect on the global economy and the regional u.s. economies in which we operate , including negatively impacting some of our tenants ' ability to pay their rent . all of our buildings are open and continue to operate . we have adopted new policies and procedures to incorporate best practices for the safety of our tenants , our vendors and our employees . however , the usage of 45 our assets in 2020 was significantly lower than normal . usage of our assets in the near future depends on the duration of the pandemic , the implementation of covid-19 vaccines and corporate and individual decisions regarding return to usage of office space , which is impossible to estimate . we continue to closely monitor the impact of the covid-19 pandemic on all aspects of our business and geographies . while we did not experience any significant disruptions during the year ended december 31 , 2020 , as a result of covid-19 or governmental or tenant actions in response thereto , the company granted rent relief to nine tenants comprising approximately 1.1 % of the company 's occupied nra , most often in the form of a rent deferral or rent abatement . subsequent to december 31 , 2020 , the company granted additional rent abatements to four tenants who previously received relief , which combined comprises approximately 0.1 % of the company 's occupied nra and an immaterial amount of rental revenue . although the rent deferrals and rent abatements granted to date did not have a material impact on our rental revenue , the long-term impact of the pandemic on our tenants and the world-wide economy is uncertain and impossible to estimate , and will depend on the scope , severity and duration of the pandemic . we believe that some of the industries most impacted by covid-19 are coworking , retail , restaurant and café , travel and accommodation , live event related and energy . we generally have limited exposure to these industries , with these sectors comprising approximately 3 % of our portfolio by square footage . however , the impact of covid-19 extends to all sectors of the u.s. economy and as such , we expect that tenants outside of these select industries will also face significant challenges . story_separator_special_tag asu 2021-01 clarifies the scope of topic 848 so that derivatives affected by the discounting transition are explicitly eligible for certain optional expedients and exceptions in topic 848. asu 2020-04 and asu 2021-01 can be applied as of the beginning of the interim period that includes march 12 , 2020 , however , the guidance will only be available for optional use through december 31 , 2022. the new standard applies prospectively to contract modifications and hedging relationships and may be elected over time as reference rate reform activities occur . the company has not yet adopted the standard and continues to evaluate the impact of asu 2020-04 and asu 2021-01 on its consolidated financial statements and may elect optional expedients in future periods as reference rate reform activities occur . on april 10 , 2020 , the financial accounting standards board ( the “ fasb ” ) issued a staff q & a to respond to some frequently asked questions about accounting for rent relief related to the effects of the covid-19 pandemic . consequently , for rent relief related to the effects of the covid-19 pandemic , an entity will not be required to analyze each contract to determine whether enforceable rights and obligations for abatements exist in the contract and can elect to apply or not apply the lease modification guidance to those contracts . entities may make the elections for any lessor-provided rent relief related to the effects of the covid-19 pandemic ( e.g . , deferrals of lease payments , reduced future lease payments , etc . ) as long as the rent relief does not result in a substantial increase in the rights of the lessor or the obligations of the lessee . to date , the company granted rent relief to certain tenants , most often in the form of a rent deferral or rent abatement . for rent relief granted that did not result in a substantial increase in the rights of the lessor or the obligations of the lessee , the company elected to not apply the lease modification guidance and instead account for the rent relief as though the enforceable rights and obligations for the relief existed in the original contract . for rent relief granted that resulted in a substantial increase in the rights of the lessor or the obligations of the lessee , the company applied the lease modification guidance to the applicable contracts . results of operations comparison of year ended december 31 , 2020 to year ended december 31 , 2019 rental and other revenues . revenue includes net rental income , including parking , signage and other income , as well as the recovery of operating costs and property taxes from tenants . rental and other revenues increased $ 4.5 million , or 3 % , to $ 160.8 million for the year ended december 31 , 2020 compared to 50 $ 156.3 million for the year ended december 31 , 2019. of this increase , the acquisitions of 7601 tech , cascade station and canyon park contributed increases of $ 4.0 million , $ 1.7 million , and $ 1.3 million , respectively . revenue increased by $ 1.2 million at our dtc crossroads property within the denver tech portfolio and by $ 0.9 million at our sorrento mesa property due to significant leasing transactions during the year , which lifted occupancy and rental income . revenue from the cherry creek property also increased by $ 0.7 million , as it benefited from a lease termination fee payment during the year ended december 31 , 2020. partially offsetting these increases , rental revenue decreased at 190 office center and pima center by $ 0.4 million and $ 0.6 million , respectively , due to a decrease in occupancy during the year ended december 31 , 2020. revenue during the year ended december 31 , 2019 also benefited from a one-time payment of $ 2.6 million received as consideration for the assignment of a purchase contract . the assignment fee originated through our administrative services relationship . revenues during the year ended december 31 , 2020 were further impacted due to the sale of the logan tower property in december 2019 and the plaza 25 property in february 2019 , which decreased overall revenue by $ 1.2 and $ 0.2 million , respectively , for the year ended december 31 , 2020. the remaining properties ' rental and other revenues were relatively unchanged in comparison to the year ended december 31 , 2019. operating expenses total operating expenses . total operating expenses consist of property operating expenses , general and administrative expenses and depreciation and amortization . total operating expenses increased by $ 1.9 million , or 1 % , to $ 129.4 million for the year ended december 31 , 2020 , from $ 127.5 million for the year ended december 31 , 2019. total operating expenses increased by $ 2.8 million , $ 1.2 million and $ 0.8 million , respectively , from the acquisitions of 7601 tech , cascade station and canyon park properties . partially offsetting these increases , total operating expenses decreased by $ 1.2 million , and $ 0.2 million , respectively , due to the sale of the logan tower and plaza 25 properties . operating expenses at our camelback square and 5090 n. 40 th street properties decreased by $ 0.6 million and $ 0.5 million , respectively , due to higher depreciation and amortization expenses as a result of the full depreciation of certain assets during the year ended december 31 , 2019. general and administrative expenses decreased by $ 0.4 million in the year ended december 31 , 2020 primarily due to $ 1.1 million of one-time expenses incurred as a result of the assignment fee income earned during the year ended december 31 , 2019 , which was partially offset by higher payroll and stock-based compensation costs for the year ended december 31 ,

