I. Commitments and Contingencies Leases The Company currently has a lease agreement with CRP/King 830 Winter L.L.C. for the rental of approximately 110,000 square feet of laboratory and office space at 830 Winter Street, Waltham, MA through March 2026. The Company uses this space for its corporate headquarters and other operations. The Company may extend the lease for two additional terms of five years. Pursuant to lease amendments executed through December 2015, the Company received construction allowances totaling approximately $2 million to build out office and lab space to the Companys specifications. The Company executed a fourth amendment to this lease in April 2018, leasing an additional 10,000 square feet of office space in order to accommodate employees being retained from the future Norwood closure previously discussed. The Company is entitled to a construction allowance of $400,000 to build normal tenant improvements in this space to its specifications. The Company expects to commence recording rent expense for this space during the quarter ending September 30, 2018, when it takes control of the space. The Company is required to pay certain operating expenses for the leased premises subject to escalation charges for certain expense increases over a base amount. In February 2016, the Company entered into a lease agreement with PDM 930 Unit, LLC for the rental of 10,281 square feet of additional office space at 930 Winter Street, Waltham, MA through August 31, 2021. The Company received $617,000 as a construction allowance to build out the office space to the Companys specifications. The Company is required to pay certain operating expenses for the leased premises based on its pro-rata share of such expenses for the entire rentable space of the building. The Company is actively seeking to sub-lease this space. The Company amended its lease for manufacturing and office space at 333 Providence Highway, Norwood, MA in June 2018 to extend the lease through March 31, 2019, at which time it plans to have vac