For 50+ MF, how common is it to show a loss after depreciation?

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Hi,

My wife and I run an online retail business with extremely high "earned income". We want to start investing in real estate to offset that income by one of us becoming a "real estate professional". We don't spend more than 750 hours on the retail business, so we meet the requirements. We're thinking of starting with a 50 unit apartment building and moving up from there. Our question is, how common is it to show a loss after depreciation, and how much real estate would we need to purchase to offset, say, 800k of earned income? Thank you so much for your input. We are new here and excited to get to know everyone.