Here’s my two cents:Paying off the condo might make sense if your main goal is to reduce risk and enjoy the peace of mind that comes with no mortgage.

The main thing is to stick with great location and premium properties.

My work is mainly with investors and I co- host a women's investing in Allentown group.

Problem with Zillow and FB is they have this annoying "1-click reply" where people can just click on your ad without reading it and you get an automated message "Joe is interested in your apartment at 123 Main St."

I believe the main issue is 2 fold: 1.

That said, my main question is, can you recommend a good mortgage brokerage company that offers all the training points you outlined in your post?

Like @Russell Brazil said there are general things that need to be in place.One that stings a lot of people is the main entrance door.

I am located in Maine and have 2 six unit buildings, 2 four units, and a 5 unit. 

The property has 7 acres with a 3/2 main house and a second separate 2/1 house (which also needs renovation) with its own drive.  

If one or more units are vacant, the remaining units often don’t provide enough cash flow to cover expenses, making it harder to meet operating costs.Maintenance costs: A fourplex comes with four times the appliances, plumbing, HVAC systems, and other components to maintain, leading to significantly higher repair and maintenance expenses than single-family homes.If you want to see the detailed calculation, read this BP blog - More Units Doesn’t Mean More Money—Why a Single-Family Home Can Beat a Fourplex.Resale value: Multi-family properties have a limited buyer pool—mainly investors—who base their offers on CAP rates.