Another factor I considered is that the role will help me understand RE markets better and be looking at a lot of deals.

Factor in accurate, but worst case scenario numbers.

Just another factor to consider - if you want to keep your monthly payments the same, do not under any circumstance swap the debt over to some other debt instrument.

Look at the economics / population rates & other driving factors pushing the market into the future. 

I have been playing the multifamily game for almost 10 years now, and the GRM is one of my least favorite methods personally since it ignores so many important factors (steam boiler versus electric baseboard heat as an example). 

What ADR did you use for MTR and how did you derive the MTR ADR (or different what rent and what vacancy factor)?

what factors should I be looking at when making this decision.  

My ARVs are also reflective of those factors. 

It could certainly be a concern - but depends on a lot of factors - are you looking multi or SFR? 

Of course the goal should be on the first page by anytime but that is usually bad ROI since the price is the biggest factor on the rank.