And the same thing applies to multifamily... just the numbers a little different (not as big a gap).What I do for my clients is analyze what ALL the similar deals have offered in terms of ROI, and that way the investor can see what deals in that market are offering on average, and then truly compare this deal vs. what's normally available. 

There is limited installation in the attic and the house is directly exposed to the sun ~60% of the day, a tall tree provides cover in the evening hours when the sun is setting.With that being said, there are a lot of options in terms of the product brand, product size, etc and I was looking for personal recommendations from individuals who have gone through this before.Due to my location in the Northeast and more specifically Pittsburgh, I was thinking of getting two, 13 SEER Rheem air condensers?

Everything else stays the same in terms of tenant and landlord rights.

What would that look like in term of loan / rate?

There are really three types of parks with treatment plants in terms of economic viability which drives buyer pool.

Where are the best areas to do this, in terms of safety and return on investment?

You could also talk to a commercial leasing agent and get their opinion.You will also need to estimate expenses based on the owners current expenses in terms of taxes insurance maintenance etc.

Today I have 4 long term rental properties and it's very consistent in terms of revenue.

There is nothing an agent can do in terms of search you can't. 

Either socially or to invest*   I feel 'safe' in terms of land value, appreciation, and over all rental and sales demand when you're in a geographically limited area.