Getting lots of LLCs is not always the sign of success, sometimes it is a sign of complication and it gets difficult to keep up with all the paperwork, so very well one could have slipped thru the cracks.#4  Now looking at all the success you have posted about the owner, they very well could fight if they loose it. 

The IRS Chief Counsel released a memo stating that to perform cost segregation properly one must have knowledge of construction, construction techniques, design, auditing and estimation procedures.

Relying on general ideas is dangerous when it comes to taxes.Read this older thread to see why this area is far more complicated than you might think: https://www.biggerpockets.com/...

Buying a house and renting it out is not that hard or complicated.

It is overly complicated, the service are terrible, and they often don't fix much of anything.

To complicate things further, you should have a policy around how and when they accept your offer.

I recommend you read books or (view You Tube)written by IRA Financial founder,Adam Bergman.The beauty of tax free cash flow of 14%+ ConC and no capital gains taxes ever, far outweigh any lost depreciation deductions.This thread is getting complicated. 

Quote from @Bubba McCants: I have the same technique as Drew: copy from others, customize to your business model and laws, refine as you go.I started with a two-pager that was built in the 80s and never updated.

It will get more complicated if you're borrowing money. 

The way I've seen this work from a cost savings perspective is to hire an overseas bookkeeper to do the busy work, but also have someone higher level available to answer questions and to record the more complicated transactions.