Mid and high density housing for the high-income earners get opposed across the entire economic spectrum. On one hand, you have NIMBYs that place strict zoning restrictions and mandate bullshit environmental reviews to stall the development that does occur. On the other, you have affordable housing advocates opposing gentrification by blocking cement trucks and refusing to be leave their apartment that got bought out unless if they get paid $1 million. At the end of the day, developers can pull through by simply throwing enough money and time at the problem, but that's a cost that ends up being passed to the future renters.