In PA, a pre-existing use will be grandfathered in which would mean you might not need to comply with the new ordinance if you can show you were operating legally prior to the issuance of the new ordinance.Ask your municipality (mayor, city manager, board, etc) what a tie means means? 

I could see this is as just one of many ways to pick up good deals without much effort other than your pre-existing relationship with the client.

The Operator has to know the investors.The law is that to make an offer to invest, someone on the General Partnership side must have a substantial pre-existing relationship with the investor. 

IMO, you have a pre-existing condition AND a declaration from the current owner.Existing tenants have been there some period of time already.My plan would be to test and correct if necessary ONLY on a move-out.

I purchased this property in 2015 with pre-existing tenants.

Property tax liens take priority over even pre-existing first position mortgages.

While it may be a tougher sell for many buyers, as most people of suspicious/fearful of things they don't understand, you just might find a buyer who views a pre-existing PV system as a positive. 

You make your money when you buy, this includes land you are building on and "all in" construction costs as well as buying preexisting property that's already up and running.

Any delay will only complicate the issues.You are stuck with the existing tenant and the pre-existing lease for 10 months unless you can make his life difficult enough to convince him to leave.

From foundational repair getting the pre-existing addition up to par and accounted for on the tax record.