COMMITMENTS AND CONTINGENCIES Commitments In October 2013, we signed a lease for new office space for our corporate headquarters, and moved into the new location in the first quarter of 2014. The lease had a term of 38 months and a rental cost of approximately $5,412 per month, increasing 3% annually after the first fourteen months . In addition, our share of building operating costs were estimated to be $2,101 per month. In April 2014, we amended the lease to add additional space which increased our rent to $8,286 per month beginning August 1, 2014 plus estimated monthly operating costs of $3,154 and extended the lease term through July 2017. We had a renewal option for an additional 3 year term. The original lease included a tenant improvement allowance of $72,160 and the amended lease included an additional tenant improvement allowance of $38,320 . The allowances were used to construct our office build-out and have been capitalized as leasehold improvements as of December 31, 2016 and 2017 . The capitalized costs are being amortized over the amended lease term through July 2017. Effective April 2017, we amended the lease to add additional space and to extend our lease term through July 2018, with an option to extend through July 2019. With the amendment, the total leased space is now 9,024 square feet with monthly rent of $14,479 through July 31, 2017 and $13,987 from August 1, 2017 through the end of the lease, plus estimated monthly operating costs of approximately $7,000 . In May 2018, we entered into an agreement with the landlord to extend the lease for one month, through August 2018 with no change to the amount of rent or other payments due under the lease. We are currently negotiating a lease for a larger office space in the same area, which we expect to complete by the end of May 2018. We expect our rent payments to increase as a result of the new lease. In November 2013, we signed a lease for our satellite development office in Burlingame, CA. The lease had a two -year term, and rental costs of appro