You're looking at GRM. How much does it cost you to buy vs. how much money can you make off of it. And if you're crawling the data, you aren't limited to the top 20 real estate markets; you're limited to anywhere you have sales and rental data. And if you're a REIT... well, look at the numbers.
The initial public offering of Invitation Homes on Jan. 31 raised more than $1.5 billion. The single-family REIT founded by private equity firm Blackstone in 2012 immediately became the largest listed company in the sector with an equity market cap approaching $7 billion. It boasts a portfolio of nearly 50,000 rental homes spread from coast to coast in 13 markets ranging from Atlanta to Los Angeles to Minneapolis.
If you're sitting on seven billion dollars and are tasked with the mission of turning a profit by renting single family homes, you're well beyond manually scanning. And if you aren't Blackstone, you start looking at doing your search third-party.