Exhibit 10.1

6715 Kenilworth Avenue Partnership
1015 31^st Street, NW
Washington,  DC   20007

RE:Extension of Lease Agreement dated Sept 1, 2000 and
Amendments dated through  March 1, 2003.
1015 31^st Street, NW, Washington, DC  20007

Dear Mr Schaeffer, August 5, 2003

In reference to the above subject Lease Agreement between Cogent Communications, Inc., (Tenant) and 6715 Kenilworth Avenue Partnership ( Landlord), the parties agree to extend the lease referenced above for an additional one (1) year term with a new expiration date of August 31, 2004.

All other conditions of the Lease, as amended remain unchanged.