Yes, a room with 2,000 square feet of floor space can certainly contain a mezzanine area that is 25 feet by 30 feet. The floor space of the mezzanine can be calculated by multiplying its length and width, which in this case is 25 feet x 30 feet, resulting in 750 square feet.
If you subtract the mezzanine area's square footage (750 square feet) from the total floor space (2,000 square feet), you would still have 1,250 square feet of open floor space remaining in the room. So, it is feasible for a room of this size to accommodate a mezzanine of those dimensions while still having space on the main floor.