There is a contest to determine which is the oldest house in San Francisco. The two Tanforan cottages in the Mission district were considered the oldest, but, the Treat house is a recent contender.

“Tanforan cottages, you have met your match. Mission Loc@l reports on the discovery what is perhaps the oldest house in San Francisco at 1266 Hampshire (between 24th and 25th), dating to 1849. It has been traced to the brothers John and George Treat, whence the street name came.

“The house on Hampshire, historians said, was likely built in 1849 — the year a pair of influential pioneer brothers arrived in San Francisco — or 1850.” It was identified during the city’s South Mission Historic Resources survey. Gregory Thomas of Mission Loc@l does a fine job referencing maps, but he makes the rookie mistake of stopping with the 1861 Langley map in the search for Treat.  But  going…