The Tiles are the standard 500 x 500, the grid in the file is 10 x 9 but the file can be edited and arrayed to any size requried. Included in the file is the texture and the bump map for the ceiling tiles, also included are realistic spot lights and directional spotlights. Everything you need to create a realistic office space ceiling.
Aswell as in the .max file the items are given in .3ds formats so can be opened in any version of max.

(image created in vray but file can be used for any renderer)