On September 5, 2007, Cellectar, Inc. entered into a 36-month lease for office and manufacturing space, commencing September 15, 2007.  The lease provided for the option to extend the lease under its original terms for seven additional two-year terms.  Rent was $8,050 per month for the first year and then escalated thereafter by 3% per year for the duration of the term including any lease extension terms.  The lease also required the payment of monthly rent of $1,140 for approximately 3,400 square feet of expansion space.  The monthly rent for the expansion space was fixed until such time as the expansion space is occupied at which time the rent would increase to the current per square foot rate in effect under the original lease terms.  The Company is responsible for certain building-related costs such as property taxes, insurance, and repairs and maintenance.  Rent expense is recognized on a straight-line basis and accordingly the difference between the recorded rent expense and the actual cash payments has been recorded as deferred rent as of each balance sheet date. Due to the significant value of leasehold improvements purchased during the initial 3-year lease term and the economic penalty for not extending the building lease, straight-line rent expense and the associated deferred rent has been calculated over 17 years, which represents the full term of the lease, including all extensions.

The Company is required to remove certain alterations, additions and improvements upon termination of the lease that altered a portion of the rentable space.  In no event shall the cost of such removal, at commercially reasonable rates, paid by the Company exceed $55,000 (the “Capped Amount”). Any amount in excess of the Capped Amount shall be the obligation of the landlord.  The Company is required to maintain a certificate of deposit equal to the Capped Amount during the term of the lease, which amount is shown as restricted cash on the accompanying balance sheets.

Rent expense was approximately $130,000 and $131,000 for the years ended December 31, 2017 and 2016, respectively.