This unit is also in a condo complex built of reinforced concrete and has easily survived many Cat 3 hurricanes.

I will say, it could be worth considering a shot at an actual software solution built for DIY landlords (1 - 15 units) that helps you to automate some of this (ie. compared to other tools, one that helps you to actually build a single listing and syndicates it to 10+ major listing sites, but also allows you to schedule showings, provides you with super thorough tenant screening options, online digital leases which can be customized and help you by breaking out those fees, automated maintenance tracking, and fast rent collection which also offers your tenants the ability to report their positive on-time payments to the major credit bureaus; just another positive reinforcement/added incentive to get them to make those payments on time).

Moving forward might be worth considering a prop software that also gives you the ability to report their positive on-time payments, or late payments to the major credit bureaus; just another positive reinforcement/added incentive to get them to make those payments on time while on an active lease with you).

This will help clarify and reinforce what you are reading.

This will help clarify and reinforce what you are reading.

This will help clarify and reinforce what you are reading.

Can 4” hole be cut in the joist for HVAC duct and reinforced the joist to strengthen it. 

@Robin Casper you already have a good recommendation but I would just reinforce that this type of a recommendation needs to come from local people. 

You’ve got a little more forgiveness in conventional framing but, again, you’ve gotta know what to look for as far as reinforcements.

While it sounds like you're on the right path, you will still learn a lot by reading personal development books, listening to PD podcasts, talking and listening to such folks as Tony Robbins, and reinforcing the beliefs that will keep you on the right track.