The 8th Street side of 309 7th Avenue features a variety of different elements in brick including "sawtooth" brick and unusual Gothic arches at the top floor:
The two center buildings feature arched windows at the top floor:
Our attribution comes from the American Architect & Building News of 1888:
"Building Intelligence; Stores; Brooklyn, N. Y.," AABN vol. 23, no. 653 (Jun. 30, 1888): p. xxii.
– "Seventh Av e., s e cor. Eighth St., 4 four-st’y brownstone stores and flats, tin roofs; total cost, $30,000; owners and architects, Van Tuyl & Lincoln, 166 Montegue St.; masons, Buchanan & Riley."
This row is one of very few works we can attribute to the firm of Van Tuyl & Lincoln. The firm's only other work in Park Slope, to our knowledge, is a fine 3-house row on the south side of Union Street, between 5th & 6th Avenues, recently featured on Brownstoner.