Perking Up Drop Ceiling

[Jason Albasha]

I recently closed on a 4 unit and there's a non-conforming 5th unit with drop ceilings. The unit is currently vacant and, as you can imagine, the ceiling isn't the prettiest thing.

Any ideas of what can be done to perk it up? Any particular tile that's worked well for you previously? Has anyone weighed the cost-benefit of replacing with drywall? 

Thanks in advance

Edit: It's a 1/1 between North Park & Lincoln Square area to give you an idea of the clientele it'll be serving.