The other option is a water supply line, but that would typically resulting a steady leak and the damage would occur faster.Really think about what is above that space that could cause the issue.

@Trent Davis- This is on a slab foundation with a crawl space. 

We converted the attic to a coworking space with a community kitchen, front and back outdoor patio and gathering spaces.This is where you can...

Maybe one of my chicago friends could tell you their experience here @Mark Ainley or @Zach Shepard?

The latter points I have more in depth experience with given my space in the FO realm.I rarely seen them work, and my two cents is just-- an opinion.

You could either de-convert the basement before purchase, buy with plans for de-conversion, or leave it as non-living space.

Lot's of exciting traction in the MTR space.

In many places if you are not opening up walls in that space you don't have to bring that up to modern codes.

But, if any of the units are used as commercial space, you may need to structure the loan on a Mixed-Use DSCR loan which could affect pricing. 

Hopefully all of your residents are feeling merry.While Santa does need to give 24 hours notice before going down a chimney into a resident's space, does he have any plans to leave a present at your properties?