Group Purchasing Power In Expensive Areas

I currently live in San Francisco, where real estate prices are out of control! However, I noticed that once you start looking at large apartment complexes, 42 units for example, the price per unit isn't too bad (roughly $325k). How realistic is it to try and find a bunch of people interested in buying a place like this with the intention of converting them into single condos, instead of apartments?

Any feedback would be greatly appreciated :)