You have good tenants who pay market rent (more or less) and are willing to sign a 2 year lease...one thing I really like about keeping good tenants is that your vacancy rate will be a big fat ZERO for the next 2 years! 

I would see that as a big fat red flag

I may have fat fingered some numbers.

Not only did Josh and Brandon team up to write this ultimate guide, but they’re teaming up to participate in a live author Q & A session—exclusively for people who buy this book from biggerpockets.com/store!

Purchase price: $100,000 Cash invested: $20,000 Commercial building used to be a tire store, currently a Carquest auto parts store operating.

I’ve found better quality hoods, fans, and lighting fixtures cheaper than the big stores or than my contractor can find them.

As far a books on management go, check out Brandon Turner's book on managing properties which you can find here: https://www.biggerpockets.com/store/managing-properties-digital as well as the Landlord Survival Guide by Jeffrey Taylor

Some of the larger expenses-Interior/Exterior Paint, Storm shutters for a few of the front large windows, added additional cabinets to one unit,  New refrigerator from Dent/Scratch store after old one died,  Laundry units that tenant pays +$50/mo for etc. 

Treat this the same way you would any other type of new business, whether it be a grocery store, auto repair shop or landscaping business. 

The area is upcoming and near to subways, buses, stores and a major hospital.