Source: Mortgage Rates: 30-Year Fixed Rate Mortgage Average in the United States (MORTGAGE30US) | FRED | St.

I will take these lessons into consideration as I surf along.

You can't deny based on non paycheck income source. 

However, this difference in rents doesn't factor in that two-story homes on average tend to be larger than one-story homes.My data source isn't super precise showing rent-to-sqft ratios, only rounding to whole dollars.

But many of those companies (Corelogic, Black Knight) get their data from error-prone sources as well.Data in the real estate world is poorly digitalized and structured, despite the best efforts of programs like RESO. 

@Sean HaranRecommend exploring as many sources as possible to get referrals AND cross-reference them to get as much accurate information as possible.Check out NARPM.com, BP’s Property Manager Finder, etc.Also, encourage you to learn from the mistakes of others - by reading posts here on BiggerPockets about owners not having their expectations met by their current Property Management Company.

There was a guy here who described this as his number one lead source for investor money on multiple podcasts.

Feel free to reach out if I can be of any assistance, I can refer you to a couple different sources if interested.

Zillow's API is no longer offered (or they make it extremely hard to access these days - have had no luck finding an updated link/page for it), Redfin has broad-stroke CSVs you can download that only give 5-10 fields of info and not often at the metro area, you can't legally create a tool to crawl these websites...I'm looking for 1 (or a handful of sources) to pull together basic metrics at the metro/city level for US real estate.

You already mentioned you have the cash flow from other sources to live.