The "Engineering-Based" DefinitionAccording to the IRS, the "Detailed Engineering Approach" is defined by using a methodical process to estimate the costs of individual components (linear feet of piping, specific electrical circuits, etc.) based on "as-built" drawings and actual cost records.The Feedback: "It would take an engineer hours to do."

I also had a recent cost segregation study performed and they had the roof components prior to the replacement at all 39 years. 

For bonus depreciation, what generally matters is when the property or its components are placed in service as a rental, not the original purchase date.

I also had a recent cost segregation study performed and they had the roof components prior to the replacement at all 39 years. 

A cost segregation study breaks down the property's depreciation by components to accelerate the deduction.

.• Mixed use buildings or conversion opportunities along Germantown Avenue where the ground floor has the spatial capacity to seat 100 or more restaurant patrons, with a residential component above that can generate at least 50% of the building’s total gross rental revenue.• Land suitable for development of stacked duplex three-bedroom units around 1,500 SF.

A comp on the other side of town is 305k.

You're only depreciating the building and its components — not the dirt.

A defined buy box definitely helps speed up decisions.

Improvement studies make sense if your renovation is very extensive or you don't have itemized invoices to really break out the assets/improvements/components.