Have you looked into cost segregation studies, bonus depreciation, 179D, historical tax credits, etc.?

It appears that the full building is a rental(business asset) which is therefore, eligible to benefit from the cost segregation study.

@Forest Wu Here's an article with additional FAQs on cost segregation studies that you may find helpful.

Therefore, it seems this would be specific to the assets you have in your property.So a one size fits all percentage would be impossible to come up with.If people could put a percentage for the bonus depreciation there would be no need to complete the cost seg study.

To thrive, begin by studying the nearby real estate market, grasping property values, rental rates, and vacancy rates.

Some of my favorite area codes are 27107 and 27127. 27127 is a big area code so you really need to study it to make sure it’s not a problem area. 27107 is the outskirts of Winston Salem where you will find more houses in neighborhood/family type of areas.

But real education takes real time, study, effort, and desire.  

A study published by the CCIM institute looked at 50 years of history and reverse-engineered the interest costs of 5-year fixed and floating loans over 562 starting points and found that floating rate borrowers “won” 72% of the time.

Doing sun studies to see what will cast shadows on the panels and what the true average of sunny days is for your location.

I just took all my real estate classes and am studying for the test now and was wondering the same thing as you.