The area is way to pricey for my budget so I do all my investing in midwest markets (Memphis and Detroit mostly).

Goal would be to acquire 20 rentals by the age of retirement, with some already starting to be paid off.I am in the same boat as you, and I focus on safe appreciation all day (small cash flow for safety and then focused on markets on that appreciate). 

Kay Properties are very good at marketing and put out great materials. 

@Jim LynchSome typical minimum tenant screening requirements look like the following, but it depends on your market:-Renter has a gross monthly income of 3x more than the monthly rent-Minimum credit score of 650-Renter must have no prior evictions-No felons (or other notable criminal history)There are a number of different tenant screening softwares out there such as Zillow Rental Manager, TransUnion SmartMove, etc.Be sure to complete an employment verification by contacting the renter's employer and confirm the details they shared with you, landlord verification (if they have a previous landlord), credit check, and background check.

Make sure you learn the markets.

Tremont is an excellent area with really high market rents and super high demand.  5000+ sq ft. is huge too, congratulations!

Quote from @Michael Ewers: Hey y'all, Wondering what is the best marketing strategy for obtaining off market leads?

I still am on the lists of all the major wholesalers and still show up to showings occasionally on properties that might have enough margin for me but have not purchased recently from a wholesaler.Just like Adrien says, they provide a service of marketing and negotiating contracts for you.

I avoid the multi-family market here, so unfortunately, I will not be a good go-to here, but I am confident you will find quality resources and help here on BP.  

Cleveland is a great market, but hopefully my warning here will help you avoid the headaches I endured.