Compared to NYC, Boston or even Hell Ay, you get a LOT for your money in SD. At least if you’re talking about housing in nice, walkable locations.

In NYC, $400k gets you (common charges include property taxes)…
http://streeteasy.com/nyc/sale/665814-coop-130-east-18th-street-gramercy-park-new-york
http://streeteasy.com/nyc/sale/661538-coop-321-west-90th-street-upper-west-side-new-york
http://streeteasy.com/nyc/sale/690940-coop-22-grove-street-west-village-new-york