As such, just upkeep and maintenance of the yard became a factor in deciding to sell.

I'm currently adding all of my numbers for a 20-unit apartment building in for a test, and then I'll bring my other 90+ units.

I would definitely factor in some substantial capex/ maintenance and repair costs which could lower your returns.  

You are working a demanding corporate job but also want to build rentals on the side.

The discipline to run on a budget for a number of years or decades depending on your math, doesn't factor in emergencies or market changes where the HELOC could be used to invest in other places.

Building a Team: While I can handle most of the renovation work myself, I’d need an electrician and possibly a real estate agent.

Start with one close to home where you can learn and build a team.

Does size of mortgage paydown become a factor here?

I’ve just made an offer on a building and the listing commission was 3% paid by the sellers.

I just wanted to make sure there wasn’t a limiting factor of showings or interest.