As a landlord you aren't handcuffed by one-size-fits-all rules like I am, and could make that determination accurately. 

You just have to run the numbers tight and accurately.

I did a you tube video about this and cases that get thrown out of court due to logs being being accurate enough, vague, time inflated, ect Your GC time and Engineer studying time don't qualify I would think- Again it has to be directly time on your rentals. 

I have been using whitepages.com, spokeo.com and beenverified.com and almost never get accurate phone numbers or email addresses.

A careful review of rental agreements will assist in making accurate cash flow projections.

A careful review of rental agreements will assist in making accurate cash flow projections.

To accurately get an answer to this question in your market, you just need to jump on zillow, trulia or hotpads and shop similar units to see what rents are being advertised for which amenities. 

I'm new to the real estate scene, and I saw this interesting video on getting a very quick initial estimate on rehab costs as you're considering a bunch of deals.https://youtu.be/EtCDWoJVtOEIs what they're saying fairly accurate for an initial estimate, as in, using this to filter out most of the bad deals, and then do a more careful estimate on the promising deals?

This gives a more accurate representation of the retail market in MA.

After that, it's do your due diligence to make sure you have an accurate grasp of rental rates, occupancy, expenses... then dive in!