It may be hard because the size of the rehab but get an GC to give you an itemized list of repair cost for your rehab and sub out the items you feel can be done cheaper.4.)

He has asked for fair market values for items that will be included in the study (ex: roof, water heaters, HVAC, cabinets, appliances).

In 2023 it will drop to 80% which means that in a cost segregation study, 80% of all items that qualify for depreciation in 5, 7 and 15 years can be depreciated in the first year (just like the 100% Bonus did) and the next 20% can be accelerated to the appropriate category: 5, 7 or 15 years.

See if they can give you an itemized scope of work.

Go over the bid line by line and decide what repairs you need to move forward with and what you don't need and remove the unwanted items from the bid. 

The true value of RE is in what those two items represent in the form of future cash flow and property value. 

It has not caused an issue because I value the learning I had to do to complete the above mentioned items.

Do I have to fill out a separate Federal 4562 for each item and check it off as bonus depreciation, or can I bulk the items together - either all of them total, or the 15s together and the 5s together?

Real estate investor, if you did a cost segregation, amortization, depreciation, 1 time expenses, 1 time closing cost Fee's and this can differ from residential financing compared to 5+ financing.  1 time expenses on properties can be new roof, appliances, A/C and bigger ticket items. 

I have a list of items my PM is recommending to meet the section 8 standards, I want to make sure all of them are necessary.