Writing off office space in a mixed-use building?

[Timothy L Olsen]

I couldn't find this question elsewhere, but it's likely been addressed. I'm considering buying a mixed-use building with apartments upstairs and commercial space below. I'd like to use a part of the commercial space for my property management office space. Will I be able to write off the use of this space much like a home office or if I was renting commercial space from someone else? Thanks for any insights!