13.  COMMITMENTS

Real Property Leases

On September 5, 2007, Cellectar entered into a 36-month lease for office and manufacturing space, commencing September 15, 2007.  The lease provides for the option to extend the lease under its current terms for seven additional two-year terms.  Rent is $8,050 per month for the first year and then escalates by 3% per year for the duration of the term including any lease extension terms.  The lease also requires the payment of monthly rent of $1,140 for approximately 3,400 square feet of expansion space.  The monthly rent for the expansion space is 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 (“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.

The lease has been extended, in accordance with its terms, through September 14, 2014. Future minimum lease payments under this non-cancelable lease are approximately as follows:

The Company also leases office space in Newton, MA, which has a term that is month-to-month and requires monthly rental payments of $5,300.

Rent expense was approximately $227,000 and $197,000 for the years ended December 31, 2012 and 2011, respectively and approximately $1,368,000 from inception to December 31, 2012.

Equipment Lease

Certain equipment is leased under a capital lease.  The lease agreement requires monthly principal and interest payments of $217 and expires on September 3, 2014.  The outstanding obligation is being amortized using a 7% interest rate based on comparable borrowing rates.

The following table provides the estimated future minimum rental payments under all capital leases together with the present value of the net minimum lease payments as of December 31, 2012:

The equipment recorded under capitalized leases is included in fixed assets as of December 31: