For those that may not know, the fenestration business is simply know as the window/door market.

For what it’s worth - my 0.02 is to do a lot of networking - ask people what they do or have done, find mentors and partners, and start that way.

Knocking on doors I assume and asking residence?

Without a basement door everything is up and down steps thru the house .     

I have gotten to know my landlord pretty well and he has been in REI for over 30 years and has 70 doors so I'm guessing he went with that make for a reason. 

Don't wait till you've got that many doors to start operating them that way.

Your per door profit varies a lot...I personally don't want to see less than $200/door on my multifamily deals, and that is considering 10 or greater doors. 

@Jj Horst If you had potentially $290K in Equity between 4 doors, that should mean you have some decent cash flow, right?

The garage is attached through a staircase and door to one of the upstairs apartments...but the electrical for the garage is not wired through that apartment's meter.All water is common. 

Kitchen has had an active leak- source unknown- that has damaged most of the cabinets, master shower and tub are non-functional, AC unit needs to be replaced, garage door needs to be replaced.