I know of several other businesses doing both flips and rentals under the same company, but my main question... what is the best method for managing this in quickbooks (or possibly another platform)?

Hey @Jerryll Noorden - it really depends on what you are trying to achieve as there are so many options, the platform also changes quite rapidly.I have eight years of experience with facebook ads and marketing message me if you still need help with this.  

Absentee Owners have been popular for a long time, and are apparently still somewhat effective (people are still mailing to them) but they are getting multiple offers to buy their home.

For example in your area, Scottsdale seems to be popular.

As for online/electronic options, Cozy is a popular online one because it’s designed for rent collection.

BiggerPockets is an excellent platform to utilize so I would recommend using the 'keyword alerts' function, 'search' function and lastly, stay active on the forums!

In that time, I have seen property values increase exponentially in almost every popular destination except for one.

In no particular order I have listed some of the most popular markets for out of state investorsCleveland, OhioDayton, OhioToledo, OhioYoungstown, OhioCincinnati, OhioMemphis, TennesseeBirmingham, AlabamaKansas City, MissouriSaint Louis, MissouriIndianapolis, IndianaDetroit, MichiganErie, PennsylvaniaLouisville, KentuckyMilwaukee, WisconsinJackson, MississippiEach of these markets is popular with turnkey investors because of the low barrier to entry, high rental demand & high rent to price ratio.

Absentee Owners have been popular for a long time, and are apparently still somewhat effective (people are still mailing to them) but they are getting multiple offers to buy their home.

These platforms will bring up comps for both single-family and multi-family properties (apartments).