You'll need to prove that the tenant was negligable and it wasn't a defect in construction I believe, which will be pretty difficult.
Tiles popping off isn't all that uncommon and it's usually caused by one of two things: an inadequate backer board allowing moisture to penetrate the grout and damage the wall board, anything from long fanless showers or the shower head being directed at the wall could contribute to this problem; the thinset used to adhere the tiles being improperly mixed or allowed to sit for to long before use resulting in poor adhesion.
How much it sets you back depends on many factors..
Is there mold behind the walls as a result of the moisture penetration?
More tiles are probably on the verge of popping off, do you intend on replacing all the tiles and wallboard just to be safe?
What type of tile?
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