[aibara]

It really depends on the local laws for declaring historic districts. Much of the time it can be a long process, with lots of community meetings, revisions, etc. (On the national level, you need the property owner's consent to get listed on the on the National Register of Historic Places.) I imagine in some cases the process has already started and the new owner might not know about it, especially if you are talking about short periods of 90 days. And if a community is united against their area being listed, it can fail. But, again, it all depends on the local situation, and if a majority living there want things to go one way, then a lone owner can be screwed out of doing what they wanted.