The house will surely continue to appreciate while I either rent out the property or Airbnb it. 

That's a nice situation you're in, and I wouldn't touch the underlying 2.625% loan.

We completed the updating of two of the units so far, and rented both.

We found this deal on the market.

The first line you mention the increasing friend of investor looking for.

Curious to get some tips from folks that have a larger portfolio (say 50+ units or larger) across multiple MF buildings (so different acquisition dates, financing, etc.) and what software you use?

Have a salon with a water heater that was installed around three months ago, and the tenant has complained that it's having issues heating the water; I suspect it may be an electrical issue with the system. 

Here are a few suggestions on how you can maximize the wealth of information available: Check out the blogs and podcasts, or take advantage of the search feature (magnifying glass).

Any tips or opinions on this topic would be much obliged!

And how accurate are the comps you’re getting from the CMA compared to other tools like PropStream or MLS?