The following description of the Blackstone Court Historic District is excerpted from the
San Francisco Planning Code: Article 10, Appendix H.
The significance of Blackstone Court Historic District is more historical than architectural, though enough physical evidence of past history
remains to create a sense of the former place and time in this unusual mid-block enclave of five structures on a blind alley.
The north line of the ally [sic], Blackstone Court, follows the north line of an early trail shown on U.S. Coast Survey maps of the 1850's and 1860's, a trail that ran
from town toward the Presidio, around the north end of Washerwoman's Lagoon (now drained and filled; so named for the Gold Rush laundries). The
western end of Blackstone Court is the western edge of William Eddy's 1849 Lagoon Survey which set up a grid parallel to Market Street, facing the
view through the Golden Gate.
On a lot alignment perpendicular to the north edge of the old trail, 9-11 Blackstone Court appears to date from the
1850's because of its Gothic Revival veranda and its interior plan and finish. It is first documented on its site in 1893 (possibly moved to clear
a street right-of-way designated by the Laguna Survey of 1889-91). Before 1899 it was raised a story by the Favilla family from North Beach, very
early Italian-American residents in what became the Marina District.
Abraham House, 30 Blackstone Court, was constructed in 1885 by Charles Abraham,
and enlarged by him in 1905. Abraham was the horticulturally significant founder of Western Nursery, which operated on most of this block from
1885 to 1947. It was the last expression of the Cow Hollow/Marina District agricultural enterprises.
An Australian peppermint tree and a
Monterey Cypress appear to date from the nursery. All of these elements combine to present a unique physical expression of the pre-1906 settlement
patterns of this section of the City: the pre-Gold Rush trail, the lot lines perpendicular to it, the nursery, the modest old houses and early,
pre-1900 Italian-American investment in the Marina District.