STR's aren't impossible here, but depending on the area, you'll find them to be extremely seasonal.Other strategies that have worked for me and my clients is the MTR route, there's a robust hospital system in both NYC & LI that is always hiring contracted nurses for 3-6 months contracts. 

That doesn't give them what they need.If it needs a stamp by a licensed Architect or Engineer, that cost would be additional.

I would say including architect, engineering and permitting costs, you'd be at about $250,000. 

Market in Cleveland is pretty robust but if this guy is just going to Ghost you your probably a good year or more away from getting your collateral back If its abandoned as the lender you have the right to secure it..

I currently have a very stable software engineer position and eventually hope to cut back hours or become a contractor that works 20 hours per week once I am able to hit some of my financial goals.The ADU seems like a potential way to keep my mortgage expenses down since I would just pay for it up front with the sell of the property.

At 7 doors it's not necessary, but of course software can save you time, especially if you grow.If you plan to scale beyond your current size, I would echo other folks above that you should look into one of these more robust software solutions sooner than later (re: Buildium, AppFolio, RentVine, etc.)

I have 8 years experience in commercial construction, civil engineering, and project management, so hoping to leverage that skillset to help me.

A lot of full time teachers/engineers/parents/workers use PPC to grow their part-time REI hustle, because they have limited time during each day. 

The study identifies with forensic engineering detail the immediate Bonus Depreciation 5, 7 and 15-year personal property class lives qualifying portions of a building that are normally buried in 27.5 year residential or 39 year commercial categories.

Costs and value engineering - are you able to discover opportunities for cost savings or time savings?