They're close to retiring now, and are strongly considering scaling down their business and jumping into real estate as a retirement "job"/income supplement.

I still work my day job which supplemented the down payments for my first 4 rentals.

So many variables.FWIW, my goals are to help me save for retirement and if I'm well on my way to that, perhaps provide supplemental income.

Minor rent increases over a long period is not a positive move forward it is simply supplementing your tenants rent at your expense. 

Since last year I have bought 16 properties now as rentals that I manage myself and my goal is to grow that to about 150 to help supplement my income.

First, let's define what this is:A capital call (aka cash call) is the process when the general partner(s) attempts to collect additional funds from their investors to supplement the financing for a real estate project or transaction.

I’ve found Orgain Plant Based Protein to be a great protein supplement.

I decided to rent my unit to supplement my income this year but the market in the Bay Area is saturated right now.

My goal is to supplement retirement income and possibly retire a little earlier.We live in a small town 7,000 to 8,000 people.  

As for the heat rising at an insufficient rate if you use it for your mother in law you could add an electric baseboard unit to supplement.