Non-permitted duplex in Baltimore City?

[Timothy M.]

Anyone else have experience with a non-permitted duplex? Specifically, found a SFH rowhouse that has been (without permit) converted to a duplex; between the two units, the numbers are quite good (2% per month) but I'm wondering how much of a legal headache this could be. The area is zoned R-6 so from what I have read/heard, it is nearly impossible to have the rowhouse rezoned as a legal duplex.

I have friends in other geographic areas that have non-permitted units (looking at you, Chicago!) and it's never been a problem. If it makes a difference, I wouldn't be putting any debt on the building and just purchasing in cash.  

Thoughts?