So, you do not get to own bonus properties because the deed is wrong. 

But was happy to help him out with that bonus money for his next place, if he makes both our lives easier by staying out of eviction court. 

I suppose it's possible that they're getting a referral bonus too by moving you over but that seems suspicious.

A portion of the rent you pay will be going towards your down payment, which is an added bonus.

And you've saved money-bonus. 

This book has been an eye opener for me on how to save money on taxes and how not to give away your precious funds back to the government.I would suggest ordering it from bigger pockets because you get the below bonus PDFs https://get.biggerpockets.com/taxbook/Bonus #1: What Records to Keep and WhyBonus #2: When to Call Your CPABonus #3: CPA Fireround!

They have the bonus of being able to provide both air conditioning and heat.I'd go mini splits, but get estimates for a few options.

My question is can I use the accelerates/ bonus depreciation against my tax liability for ordinary income?

This is the last year (2022) for the 100% bonus depreciation tax benefit introduced under the Tax Cuts and Jobs Act (TCJA) of 2017. 

If the numbers work there, appreciation is just a bonus for me.