I’ll still come out with a good profit, but to sell a, sometimes, high cash flowing SFH with a 3.75% rate also seems crazy.TIA!

While I'm relatively new to REI, I bring with me a quarter century of lessons learned in running high-performing teams, managing projects, and getting things done. 

I also highly suggest teaming up with a broker who you'd want to build a relationship with and truly understands the ins and outs of different underwriting guidelines.

As to the original question where to get the data  I highly recommend Property Radar  check it out.

Am I missing something here or is the BS meter is at an all time high? 

She does not have money for her expenses and is borrowing at a high rate of interest which is becoming impossible the idea is to sell my cousins rental property take a boot to cover her expenses and the rest ($750,000) do a 1031x.  

If you are carrying a high note and this is indeed your only investment I do not think there is an issue keeping this in your name. 

That's high end for Town and Country and some of Chesterfield and blue collar/starter homes for much of Florissant.

If you can't keep control of your personal finances, you are highly unlikely to succeed in real estate investing.

Most don't allow any under 31 days or so and some as high as 6 months.I would say adding another bedroom would be better for the long term rental rate + appreciation.