Im looking to acquire another property here in MA in the next 6 months...ideally for a flip.

However, when I design my own house in the future, I plan to accomplish this in addition to other green energy features.

Remember to file as a foreign corporation in any state where you plan to do business, especially once you start acquiring property, to protect your corporate veil.Lastly, my Disclaimer: This is not legal advice. :)

If you expect someone born without legs to work you expect an acquired disability person to work regardless of origin of that disability.

Try this device to measure the noise: https://www.amazon.com/Indicator-30-130dBA-Detector-Temperat...You can also stick the same device by windows and doors to see if temperature drop - which would indicate an insulation issue.In addition to getting an Energy Audit, you may also want to look into any state, local or utility programs that offer discounted or financed energy improvement programs.

Many lenders will charge additional rate increase if loan is under $150K.

If it's generating $4000/month and can be acquired for $370,000 in that area, it's probably a wholesale candidate. 

You may have other non-financial costs associated with this type of property that compensate for the greater cash flow (e.g. additional risk, needy tenants, tenants whose priorities do not leave room for taking care of your property, etc.). 

For all of the additional work involved, I'd be hesitant to do a STR deal at 10-15% but of course it depends on what your goals are for the property and for your finances. 

At no additional charge.