If the QBI expires in 2026 then what happens to the QBI losses from previous years?  

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I'm making two assumptions here - it will take you a year to get the tenants out, and so you are cash flow negative for a year, and that year of negative cash flow is a lot less than the loss in sale price you will need to take to get it sold as-is. 

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Or will you be subject to the passive loss limits? 

.: Wondering if losses from passive rental income (I.e. long distance property managed by third party) could offset capital gains from stocks? 

It's one of the hottest markets in the US right now with so much population growth, job growth, and companies moving/developing here (26B Intel headquarters being built here, 68K+ enrollment in Ohio State University, Amazon, FB, Google, Honda, Nationwide, Anduril, etc.).

The loss is that we had not taken into account the realtor fee. 

This is because REPS reclassifies rental losses as non-passive, allowing them to fully offset active income.

But since you have already taken bonus depreciation while it was an LTR, this may not even be a concern for you.There're other potential complications such as a different depreciation schedule, treatment of previously suspended losses, and so on.