@Andrew Mugo, I most recently read UMH Properties - they do mobile home parks, Condor Hospitality - limited service hotels, and Preferred Apartment Communities (APTS), my personal favorite multifamily REIT.  

I guess in perspective, getting rich quick to most is landing some lottery, or gamble.

My favorite part of the Rental Property Calculator is being able to go back and edit the inputs. 

@Eric Swanson My favorite book in the Rich Dad series is Cash Flow Quadrant.

do you use average rent of the occupied units, average rent of all units including vacants, manually enter rent roll monthlyAs I see it, Barry Sanders, one of my favorite players of all time, there are two separate questions in there, 1: How do you account for Value Add Rent Premiums and downtime? 

The Gaithersburg and Anne Arundel Meetups are 2 of my favorites.

This is all negotiable.The least favorite topic is O&P, overhead and profit.

I have my favorite sources.

Larger operators can”t afford to gamble with the job because they have higher sunk costs in crew, trucks, estmators and answeing services and they just follow their business plan...bidding a job at what they n eed to pay overhead and make a reasonable profit.

@Eric Gamble; thanks for the welcome!