Apartments really suck for a lot of reasons: the rent goes way up every single year, forcing you to move out every year or two, because the management companies seek to maximize profit by screwing over existing renters, thinking they won't want to move. They're typically very poorly built, because they're not owned by the residents, so they're noisy. They're usually very pet-unfriendly. I could go on and on. Condos are almost always much nicer to live in, even though from the outside they look much the same. They do have their issues (crappy management at many of them, but at least in theory the mgmt is answerable to the owners and can be voted out), but there's big advantages to living in a condo over a single-family home in my experience: not needing to worry about landscaping, exterior maintenance, etc., various amenities (gym, etc.), and just convenience in general.

I don't live in SF (I live in DC), but it seems to me that what SF really needs is a lot more high-rise condos like what we have here in DC. And DC isn't nearly as "crowded" as NYC.