Summary of Lease Agreement between Micromet AG and GEK

Exhibit 10.1

Summary of Lease Agreement between Micromet AG and GEK

Grundstücksverwaltungsgesellschaft mbH & Co. Objekt Eins KG, dated 09./10.12.2002

     Effective as of July 1, 2002, Micromet AG has rented an area of 7,349 square meters, or approximately 79,000 square feet, for a fixed term of 10 years in order to perform its business operations in a new building which has been particularly developed for biotech companies. Under the lease agreement, Micromet AG had the option to increase its rentable area by an additional 2,700 square meters, but this option was not exercised and has since expired.

     Currently, regular monthly payments are equal to (i) EUR 144,882.22, or approximately $190,000 as of March 7, 2007, plus Germany’s Value Added Tax (VAT) (currently at the rate of 16%), for rentable area and parking places, and (ii) EUR 30,867.77, or approximately $41,000 as of March 7, 2007, for ancillary expenses (similar to operating expenses reimbursed to commercial lessors in the United States). The lease payments are subject to annual increases based upon the Ge