Multifamily illegal homes in Baltimore City MD

[Al Seward]

Everyone talks about how 99% of the multifamily homes in Baltimore City are not legal. Is this true and does that mean as a new investor I should stay away from those units? I don't want any legal drama. How can I check to see if the unit is illegal not?

I notice on some sites like Redfin, Zillow and others they are sometimes classified as multifamily homes. Would these sites knowingly misrepresent the home's true classification? Thoughts on this would be much appreciated.