It sounds like you’d definitely benefit from doing a study since your wife qualifies as a real estate professional.

Quote from @Sean O'Keefe: Quote from @Damon Silver: We're looking to do a cost segregation study on our duplex in Corvallis. 

Some correctionBonus depreciation is now 100%Are you sure you got a cost segregation study from the company you provided a link to(KBKG)?

Material participation and renting the property for 7 days or less are the keys. 

You can take bonus depreciation on any property that has assets that qualify.So to answer your question, yes, you can take bonus depreciation on components of a house that is used as a MTR.However, what you may want to determine from a conversation with an accountant is whether the activity will be treated as active or passive.The next question would be, even if you can do a cost segregation study, would the added depreciation from bonus depreciation be beneficial.

Any recommendations for best folks to do a cost seg study?

Whereas material participation in your LTRs is more "exclusive" to time you spend in your LTRs that you own.

But once the property’s worth gets into the mid-six figures or higher, a professional cost segregation study almost always pays for itself in tax savings and peace of mind.

If I analyze, study, purchase, renovate all the properties for myself (not other investor), it is considered "materially participated correct?

Yes, if the average stay is 7 days or less and you materially participate, short-term rental losses can offset W-2 income.