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.

The company stated, "The closings were brought about by the rising cost of doing business in California."

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

Utilities are costing me around 450/mo plus another 400/mo for pool and garden maintenance.

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

With the market turning, they have cut headcount by something like 50% last I saw. 

This is the person who ensures the implementation of the overall strategy of the business.In the mobile home park investing niche, I have found a near-limitless opportunity in underperforming parks.

The example above is a very minor cost.

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.