There was a panel of STR and MTR folks a couple months ago at the local REIA, and they preferred the smaller units.

I recently bought a house that a massive garage at the back with a loft, man door, and an electrical panel.

Idea how to market the solar panel and how to adjust the value of home? 

Ever clamped a raised panel custom cabinet door?

Pumps, computer chips/panels, gaskets, coils, elements, heaters (those last three might be all the same thing - I'm not sure) are all in his wheelhouse.  

The walls are covered in wood paneling, so I'm not sure if removing that would greatly help with the smell?

Income:All units 1 bed/1 bathUnit A --> $700 Biggest unit, has bonus room and dine in kitchen, has only off street parking spot, 15 year tenant (month to month), i think the rent could be increased to 800-825Unit B --> $600Standard 1/1, Tenant leased until May/2018, I think rent could be increased to 650 after leaseUnit C --> $500Standard 1/1, 7 yr Tenant (month to month), only unit that would need any rehab and not until (if) tenant left, i think rent could be increased to 600-650 after mostly cosmetic rehab (shag carpet and wood paneling)Unit D --> $550This is actually a studio but listed as a 1/1, has Murphy bed that will be removed and wood floor refinished from bed damage (minor), recently vacant but was renting for 550 but would possibly lower to 450 to fill quickly Additional Expenses:Landlord pays Gas/Electric and charges flat fee to cover costs.

Switching to Luxury Vinyl Panel Flooring from carpeting.

Basic stuff like updated electric panels hadn't been done.  

I ran 240v from the panel & so far the electric billing has averaged $225/month winter.