I feel like banning corporations from owning housing isn’t the panacea people expect it to be. It’s pretty impractical when you start talking about larger buildings and mixed use housing, and I’m not convinced it’s really a big driver of the problem.
I think a steep land value tax is a more workable solution. It incentivizes anyone who holds non-productive property (vacant homes in this case) to either make better use of the land or sell it. This also has the benefit of impacting individuals who own second homes or have mostly empty airbnbs.
Property taxes are insufficient for this purpose because they are generally based on the value of the home rather than just the land, so not only are they easier to game, but it disincentivizes improving the property.