I really like living in a multi-family while making repairs/modifications myself.  

The city requires any "significant" modifications (restoration or modification constituting 50% of the value) to elevate the house and secure to a new concrete foundation. 

My guy wants to charge me about $250 to do this modification, but a neighbor told me that the gas company will actually do this for free.

At the very least, I imagine I will have to get them to sign some kind of lease modification, even if one of them was planning to stay in the place right?

If you are assigning the contract then your assignment would be handled the same way with the modification of the contract being sent electronically to the seller.

•Loan modification: the previous note holder and the borrowers had negotiated a reduced mortgage payment of $400 for 3 years.

Another thing I discover is that he may be in a loan modification and that may increase down the line.

Goal:- I'd like the accessory dwelling license under my name at the time of settlementConcern:- Does a chance in ownership necessitate a re-licensing (~9 month long process), or are next steps to truly just a pay $40 and get a license renewal?

It is rigorous and necessitates the complete separation of personal and business affairs.

Tenants are still responsible for any damage caused to the property or modifications needed to accommodate the disability.