We have been married just over a year.After living overseas for several years on savings, I'm realizing how I needed a better income stream than spending my principal!  

Try to up the rent when the lease ends if the market will bear it....Another creative option, if paid for, you can owner finance the property and this passes the assessments on to the new owner and all other costs and preserves the income stream, a nice exit strategy for condos, too, to avoid the dues.....best of luck

I mentor several people and I spill my guts for the cost of a cup of coffee.  

I started investing in buy and holds and realized I could also start businesses to operate within the properties and create another income stream.

Based on your post, I would say you aren't looking for 2nd job but you do want a 2nd stream of income.

This is mainly a supplemental income stream for my family.

That's awesome that you've found a way to create another revenue stream from MTRs!

(Snow, small tinkles that have gone unnoticed, spilled water, lazy cleaners, etc) The floor that is used for commercial use, like shopping centers or grocery stores, designed for foot traffic, not little Johny running across his room in spiked soccer shoes and slip sliding all over the place scratching the brand new floor you installed only 1 month ago or constant dragging of the chairs or pointy toys.

I had a friend who did AirBnB in his home and had a steady stream of renters for various events in town as well as corporate / medical folks who come in for a few days at a time.

People are sloppy and spill things.