The investor pool here is non-existent cause it's arguably the worst RTP(no pun intended) of any relatively big or known area. 

Water Utility - 44 years ago when I was a relatively new real estate broker, a gentleman contacted me to see if we could help sell a small water utility he created.

In Milwaukee, I'd need 2 exits from the attic and 50% of the space has to have at least a 7 foot height on ceilings.Two things you want to check: both requirements are correct, but on top of that the city is getting reluctant permitting 3rd units: 50% more occupants mean 50% more water and sewer and 50% more traffic and parking.The other issue is that the cost of finishing a thrid floor with proper insulation/ventilation will run about $50-60/sf and only makes sense if you can get strong rents. 

I kept reminding myself, this is where most people stop, and this is why they don't win.Building a team around me helped a ton, I had a great lender and Agent, who knew what I was looking for and they helped me navigate this tricky waters.

I have personally seen subs who specialize in storm water management systems as well if that's something that is necessary.

We usually cut a permanent dryer vent in the wall and use that to exhaust it to the outside (instead of hanging a hose out the window, yikes again).If you don't have forced air in a property (meaning if you have hot water radiators) a mini-split system is one of the most cost-effective ways to cool a house.

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+, zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680, some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

Pool townhomes are usually a better option.

Although I have been to some Princeton homes with "pool houses" or "guest houses" that were equivalent to nice studio apartments!

BUT you just need to have a great PM as you can attract a poor tenant in that tenant pool(for the area)