Filing incorrectly can lead to more significant issues, and if you get audited or need to amend your taxes, it could end up costing you more.

The corporate veil is a real thing; no need risking law suits or audits if you can use legal structures intended to protect you.

Our firm is primarily made up of EA's (enrolled agents) who specialize exclusively in the study of tax law and representation (basically if you get audited they can defend you in tax court).

My biggest concern with cost seg studies that produce a large rebate is does that flag for audit.

I'd bet any local University has classes applicable to commercial RE investing and management, audit the course instead of attending for a grade, much cheaper

We had to bring on an energy audit firm to test and certify the work before and after construction.Beyond the planning, permitting, and historic reviews, the rest of the project runs as any major renovation projects.

Instead, I would pour through VRBO listings and audit calendars and rates to get you a picture you can feel comfortable with. 

Quote from @Michael Plaks: Quote from @Kory Reynolds: For my clients real estate businesses they pay between $4,000 and $650k purely for tax prep and tax consulting, Tell'm I can do it for $645k  ;) Do you want the audit work too?

While separate accounts sure helps with the audit trail, it's not necessary if you note the reason for a a deposit and withdrawal on the drafts or "source" document. 

Audit expenses and cut the fat.