I did a quick check on the SF Gov website to see if they have statistics on the number of single family houses in the city. The linke below goes to a powerpoint presentation on various stats for housing in SF. It has some single family data as well as information on the number of renters, etc. It is broken up by various city neighborhoods too. This might give you some information that may help with your questions as well as some additional insight into the make-up of housing in general for San Francisco.
744,000 / 2.3 = # of households x .64 = 208,695 SFH
These demographics come from Zillow at the link below.
I don't have the exact answer, but as a guestimate to tell your friend that she has underestimated: if you take Sunset/Parkside alone, there are at least 20 houses on each side of the street. From Lincoln Blvd to Wawona, there a 15 long blocks. From 9th Ave to the beach at Great Highway, there are 41 blocks. so 20 houses X 2 sides of a street X 15 block North-South X 41 blocks East-West = 24600, not counting the houses that are on the ends of the short ends of the block. Maybe there are a couple of buildings in there that house apartments, but this would be only 1 -2 buildings per block, but most of this the Sunset/Parkside, West Portal, and Forest Hill is single family housing. Yes, houses. Actually, some houses that may be bigger and nicer than some found in the suburbs. I doubt 6000 single family homes is an accurate estimate. Tell your friend to take a shopping trip to Stonestown Galleria and start counting the single family homes in the surrounding neighborhoods of St Francis Wood, Sherwood Forest, West Portal, Forest Hill, Lake Merced, Ingleside, Westwood Highlands, Balboa Terrace. She will be up to 6000 even before she gets out of the immediate neighborhoods around the shopping mall!
Yes Gregory, I'm still interested but it is just general curiosity, nothing more.
If anyone runs into he number, please let me know.
In the meantime, I'm figuring my Christmas Eve part companion was nipping a bit too much egg nog when she came up with the 6,000 statistic.
Best to all, Fred
You are most welcome.
Your friend's number of 6,000 is quite unlikely. Here is a quick search for S.F. demographic; says it's for S.F. and S.F. county. The total population is around 744,041 in 2006.
let's say we have 6 people per SFR on the average, 6,000 homes are for 36,000 people. Of course, depending on how small a section your friend is talking about.
Just think about how many areas there are in S.F - Alamo Square, Anza Vista, Aquatic Park, Balboa Terrace, bay View, Bernal Heights, Sunset, Richmond, Castro, Chinatown, Pacific Height, SOMA, etc.
Knowing how far the number might be from 6,000, are you still interested in finding out about the number of SFRs in S.F If so, which specific area(s) are you interested in?
Although keep in mind that S.F. Bay Area real estate is very location driven (for that matter, any real estate), so really depends on which area /characteristic you are interested, that's where you might want to put your emphasis in.