We've never felt comfortable with these types of buildings, and all the convoluted regs, and the types of (sometimes) entitled, unappreciative tenants one tends to find inside these properties makes it hornet's nest of problems that simply aren't worth the trouble.I know that some are prepping a lawsuit, but I don't know much else.https://nypost.com/2019/06/24/landlord-groups-planning-lawsuit-over-new-ny-rent-law/

They might run 100-$500 an hour, but it would be 100% totally worth it to file a lawsuit in federal court alleging fraudulent inducement, misrepresentation, duress, etc. 

Again, you can deduct the cost of the cleaning from the security deposit if necessary.Consider legal action: If the tenant does not comply with your request to vacate the property and/or pay for damages, you may need to file a lawsuit to recover any unpaid rent, damages, or cleaning costs.

This can obviously make an impact to how the space/rooms are orientated.One concern with finding a building which already has the "in-law" suite is that the work may have been done illegally, without a permit, which could cause issues down the road if you are looking to do any other remodeling within the building.

Especially in a law suit.

If you fail to follow the rules, you may open your personal assets to a lawsuit.

For instance, if there was a fire and a person in your basement was injured or killed, and the inspectors determined that the basement unit was un-permitted and the ingress/egress points were not up to code, you could be facing a big lawsuit.

You could leave all utilities joined and create a “mother-in-law suite” that does not contain a stove and rent that as part of your home legally. 

These days everyone wants to bump up the value of the house by saying that they have an in-law suite or "other rentable space".

With Amazon coming to Nashville I’m predicting that houses will continue to inflate and I wanted a house to live in with a finished basement/in law suit anyway.