The issues come when you have many people per unit combined with turnover or even a rent increase then multiply that by several units and it becomes work to figure out the dates of residency, amount paid, etc. 

. = Sales Price divided by total Sq.Ft. or GBA (Gross Building Area)GRM (Gross Rent Multiplier): Sales Price divided by Annual gross rents. 

DO you want to continue to live in NY, where cost of living is going to increase and where they champion kicking out 25,000 high paying jobs that would create an additional 75,000, with job multiplier.

Multiply them by 5% and you got about 2K ACTIVE wholesalers across the United States.And the general rule of marketing is that at any given time, 1% of the population is interested in what you're selling.So, I just did a search on Freedomsoft and in San Diego County, there are 9,782 3-bed / 2-bath Out of State Owner single family homes.

Many calculators screen scrape unsophisticated rates and just multiply across a band of occupancy estimates which can be pretty inaccurate.