At that time, RCA’s general contractor was given access to examine the units to pre-order all the materials needed for the 4 apartment renovations.

So you need to make material changes to your listing to justify duplicating it, not just because you want to get around some Airbnb policy.  

Because of this, they're purchasing their own supplies/materials with very minimal labor expenses.

You need to pass "material participation" test and personal use test, but that's for your future tax professional to explain.Yes, bonus depreciation is possible, but only on the current value of the personal property and land improvements.

I think you should at least get all your finish material pricing figured out first by going to the material stores and also getting quotes. 

@Rob BlockI did a material amount of research into this earlier this year.

I'm working with a reliable contractor and investing in quality materials for the master bathroom, kitchen, and guest bathroom renovations, which I hope will position the home for potential insurance discounts.Benefits of Lower Insurance CostsBy strategically planning and executing renovations during the remodeling process, I'm hoping to lower my insurance costs and save money in the long run.

This status is achieved by materially participating in your real estate activities.

There is also coverage for materials In-Transit & at temporary locationss as well. 

I have already read Rental Property Investing by Brandon Turner and I'm looking for new material to read.