There are very few empty plots in the Mission. The few that exist are slated for development, or vacant for a reason. Try to find one, other than the gas station by 16th street BART (which I almost guarantee is what you’re talking about, and is an exception, not a rule.)

You’re also overstating the support from “local residents”: the fact is that the city council gave a prime plot of redevelopable land (in a city with little available) to a sports team, as part of a sweetheart tax deal. It’s a criminal misappropriation of resources that was made behind closed doors.