Following the construction of the Potomac River Freeway, the three isolated row houses (2635, 2637, 2639 I St.) are all that remains of the once-thriving neighborhood west of 26th Street. The houses were included in the original proposal for the Foggy Bottom Historic District, but omitted from the final designation, so they lack historic protection. The highway construction has left the houses difficult to access.

No. 2639 is a single dwelling that appears to have been designed as a double residence, and has a side entrance on 27th St. as well as two front doors. It was built by W.H. Serrin and owned by Edward Welsh in 1877.

The house has a raised front patio with an iron railing and canopy. Its cornice is dentilled and matches those of Nos. 2635 and 2637.