hi eric. all i can say is just do it. in the future, you will have less regrets about doing it than you would have for not doing it. i had 3 kids, all under age 5, a wife, home and a full time job and i went back to school to learn accounting. somehow, i got thru it all and managed to graduate with a 3.74 GPA. just do it. you will find the right way to manage it

In this day an age in Canada, saving your money in the bank earns nothing.  

If someone ages out I leave it alone. 

18 or older as @Nicole W. says, not just those over age 18, should be listed as tenants jointly and severally liable.

I see these companies offering to help you build your business credit by offering to sell you an "aged corporation," as if the simple fact that a corporation is old is going to induce a lender to make a loan.

Homes that have sold recently that are similar in age, and size.

(with names, relationships, ages, phone numbers, addresses, etc.)3.

What makes discernment difficult is the age of our buildings (100+ years old with unusual building methods, etc.)Thanks so very much for this advice.

This has nothing to do with any depreciation you've taken on the property and everything to do with the age and lifetime of the damaged items. 

Great question @Rick Turman  Are all the duplexes and the SFR built from the same materials, similar age of HVAC systems, plumbing systems, electrical systems, same roof type & age, similar appliances, etc?