Before you proceed take the time to study your state landlord tenant regulation.

Cons: 1. 4+ family in NJ is subject to state regulation/inspection/tenant protections.

Interest rates affect the flow of capital, supply & demand for capital and required rates of return on investments. 

@Stuart GardnerDon't be discouraged, the Boston real estate market has a lot of competition and is a sellers market so there is little supply and prices are high.

You could always reroute the electrical amd gas from her unit to supply the laundry mashines ; )If you don't want the machines and and they work.

Your local zoning officer would be the first place to start, then there should be some state board that regulates hotels, they would have some input.FWIW: really bad idea.

I would find it hard to believe that a contractor will purchase a window that meets that criteria, rip into an exterior wall and excavate for clearance all for $1500, including the cost of supplies and labor. 

You must use 1099 forms designated and approved by the IRS available from stationery or office supplies stores, or follow its procedures for filing electronically.

Know what you want done, and be crystal clear with the contractors.Have all the supplies.

I am comparing the complete build to the cost of the shell, plus my supplies cost.I figure it is worth my time, even paying the mortgage out of pocket while I complete the several months of work myself.