Also, your preference of location and condition may restrict your opportunities if you are too picky. 

I'm wondering how significant this is overall regarding resale, and whether I should adjust the MAO to be lower than 70% to accommodate the location--or expect a lower ROI at sale.

depends on location, in a city they should be within .5 mi, in a suburb 1 mile and rural  5 miles but unique properties can be stretched further, I have done thousands of BPO's for banks, the rules were 3 listed and 3 solds, within 20% speck and similar condition, and make appropriate adjustments for differences, there is more art than science to it.

It's a nice location and in good condition. 

It's in prime location right next to the local college. 

Especially given the fact that I already own the house and don't owe anything on it.I am located in Dallas, Texas.

My property is located in Grand Rapids, MI.

Where is the property located?

Currently property management and locating properties for cash buyers.

It's time to 1031 into less debt, higher cash return and either a different class/location more passive property.