As the population ages I think these investments will become more profitable.

Back in the Middle Ages, when I was a commercial broker, there was a guy named Minh Ho who made three or four offers on properties per WEEK.  

Also, what is the age of each building and the major systems?

We are in the information age!

Generally: 1) you need to call a list of LIKELY motivated sellers like high equity, seller/property of a certain age, inside your buy box, notice of default/liens/etc. 2) You need to make an enticing pitch, "Hi Mr Seller, I'm Gus and I work at ABC Solutions, a local family owned business that helps sellers get cash fast for their homes, would you be interested in an all-cash offer for your home?

Other factors include the age of the house, the specific suburb, the amount and type of repairs needed, etc.

Once you've found them in the geographical area, then you must find as close to age, beds, baths and sqft as you can so as few adjustments need to be made.

Are we not in the day and age of 1 solution?  

I worked Northern Lake County Mendocino county and  little bit in Humbolt ( Honeydew area) I think as we age out as investors we start to appreciate cash and smaller debt positions.

We will want to retire at a decent age and also want to help the kids with college.