Can one take advantage of the tax deductions associated with rehab, appliances, furnishings, STR set up costs, etc) that were required to get the new property STR ready in Tax year 2025?

Just toss all the interior items - it is not worth the time and opportunity cost.

Source: Google search.Low operating cost - It's not about how much you gross, it's about how much you net.

I have attached a spreadsheet I've created on the following cost of developing a duplex.

Normally, doing the work yourself seems like you are saving money, but it actually may be costing you more if you factor in time. 

The frustration of managing 28 locks, each plagued by the same problem, has underscored the need for a more robust and reliable smart lock solution.In summary, the Yale Assure 2 locks have proven to be a costly disappointment, especially when multiplied across 28 units.

We know we still have to pay for a property manager as well as we are out of state in Michigan and other operating cost along with utilities.

The example above is a very minor cost.

It's a good idea to fund the "model home" if you plan on doing the "let me build your dream home" method, that way there is something to showcase instead of just plans and land.

We've all seen the potential benefits: faster construction, potentially lower costs, and the ability to design unique living spaces.