Install additional stackable W/D units in the garage (requires some electrical work).2.

Doing additional payments will shorten the life of your mortgage and save you a lot in interest. 

A factor is whether the panel and electrical can handle the additional load.

However, I definitely recommend pictures any time a guest left damage or extra cleaning that will result in additional charges.

Basically this complex is six unit three-story and all one bedroom with 700 sq. ft. each. and street parking (no parking garage) Please let me know what additional info I need to provide to better helm me on this project.thank you 

Is there the option to rent a bedroom on your side of the duplex for additional income?

In addition to checking Airbnb monthly rates, I checked the MLS to see what monthly rents were.

Quote from @Mitchell Gunlock: Quote from @Cliff Benner: Looking for Tips on how to find places that have multiple cabins or additional dwellings on a property that I could live on and run.

Usually companies are charging 10% on top of maintenance repairs, in addition to one months rent as a placement fee for leasing unit.

In addition, I am considering changing my furnaces/boilers to have plug-in cords instead of being hard wired so that if there is a power outage in winter that I could power that heating system with a portable power station.