Large institutions own 5%. Most of these "investors" are house flippers and small landlords trying to "make it big in real estate". It's not the 1% strangling the working class, it's the 10%. Any solution that doesn't hit them the hardest won't be a solution. Infact, we want more density, we need more gentrification, so I don't want to discourage large institutions from investing in a new apartment. But at the very least, if you claim to care about housing prices, don't prevent the government from building more housing.