Seems like the township did not deemed the property a legal for unit property.

First, there are small grammatical issues with their website that could indicate it might have been built by someone whose native language isn't English. 

A clean U&O means the Seller doesn't have to do anything.The home inspector is a different issue.

There's a good chance the issue(s) you face has already been discussed and answered.Ask questions in the appropriate forum.

But that has its own issues as well including having to do a hybrid foreclosure/ejectment action. 

This was my first property, and while it's been a great learning experience, I made several mistakes along the way—ranging from choosing a realtor who was more focused on closing the deal than finding the right house to having a poor inspection and overlooking issues hidden beneath the surface (literally).

I am exploring "office hacking" but i don't know if there are any legal or zoning issues with something like that. 

@Sunil Kale you're making this more compliacted than necessary.Follow @Nathan Gesner's outline and have your agent post a Legal Entry Notice on the door.

If a landlord needs to enter a property for an inspection or repair, a two-day notice is required.Our Governor passed anti-squatting legislation a few months ago which allows owners to have the police remove them as opposed to before where it was considered a legal issue for attorney's to deal with.

I also manage hundreds of residential and commercial properties outside of STRs so I actually understand how seller friendly these platforms are compared to the legal and government system outside of STR world need to deal with.