I don't see how raids would be a problem for honest landlords. You'd require people to inform the authorities when a place is empty and when it isn't. You pay t

I don't see how raids would be a problem for honest landlords. You'd require people to inform the authorities when a place is empty and when it isn't. You pay taxes when it's empty more than x% per year. Authorities check randomly and you pay a fine when the place is vacant even though you said it wasn't. I don't see the problem. The solution with fines for vacant retail space seems very inefficient and a bit unfair, since the developer can probably do very little once they sold appartements, and has little influence on whether they are vacant or not.