If anyone has done this type of project before and has a detailed/itemized breakdown of project cost (invoice), I would truly appreciate if you can provide me with a copy and any guidance.thanks!

After adding those four items back in, it brings the complex to making around $6,500.

Also, how old are your capex items? 

The PM should provide itemized items of what was done.

This is true for bonus depreciation items as well.  

Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

We pride ourselves on fast, efficient service and eco-friendly practices like recycling and donating items whenever possible.

One your loans will be a higher interest rate, next you will have annual filings, the cost of a registered agent every year, and items like that. 

It is not your responsibility to house this person's items indefinitely in your rental. 

Just clearly state that you supply a starter supply of listed items and you should be fine.