I don't want to fork over 50 K into a tree that will rot in a relatively short period of time.  

If you're a 5% owner for only part of the tax year, then only the services performed during that period count toward qualifying.Also, it's important to note that the Tax Court has held that merely being on calls doesn't meet the 750-hour requirement.

Once the initial 3-month learning period ends, you're essentially on your own unless you can continue to afford the $500 monthly fee.

How are builders adapting to these longer holding periods, and do you think there’s a strategy that could help them navigate these challenges more effectively?

If you received a variance, once the notice of decision was posted and appeal period ran its course you should have first obtained your zoning permit.

Also remember the time these returns will take to amend along with the possibility of opening up audit periods/red flags with the IRS due to amendments.Doing this yourself on turbo tax likely won't be your best bet considering all of the details.

I've used propstream, but I would like to find something that is just a pay per list, not monthly fee.Second, are there any tools that allow you to search for individuals that have owned multiple properties over a given period of time? 

Period.

Set up 1-2 hour time periods on Saturday/Sunday through messaging of when your dad/can call him the showing agent can be at the property so prospective tenants can view the unit (will save him a lot of back and forth).

I am considering buying a quadplex as a house hack, but the eventual goal would be to move back into my current primary residence rather than buy another, so the seasoning period for me to get another loan would not apply.