Multi family Fire resistance separation

[Davinder Hans]

I’m looking to purchase my first multi family property. It’s a 2 story 6 unit building.

There is currently an inspection order on the building that states the drop ceiling tiles should be replaced so that there is a fire separation with a fire resistance rating of not less then 30 minutes.

Is this achievable by just replacing the dropped ceiling tiles with newer higher rated tiles? Or does it have to all come down and be dry walled?