Theoretically yes it can; however, it would take a lot of work. the aluminum base of the front wall on the squash court would have to be removed and the court itself would have to be extended (Racquetball courts are longer than squash courts). Also, the red lines on the walls and floor of the squash court would have to be removed and the floor markings would have to be repainted to correspond with racquetball.
Court configuration aside for all four sports... For strokes and general play, squash and racquetball are most similar. For court strategy and the value of physical conditioning, badminton and squash are most similar.
That is a matter of opinion. Due to the fact that squash and racquetball are fairly different, some people prefer squash while others enjoy racquetball.
Racquetball originated from the sports squash, paddleball, and handball.
Racquetball originated from the sports squash, handball, and paddleball.
A racquetball space could be converted into 2 usable levels but each level would need to be 40 feet long, 20 feet high, and 20 feet high to meet the official dimension regulations for a racquetball court.
racquetball and squash
squash and handball
Though the sports of racquetball and squash differ in many ways, there are a select few major differences which are relevant to casual play. One main difference is the equipment used in each sport. Racquetball racquets are shorter, with a maximum length of 22 inches. Squash rackets have a maximum length of 27 inches. A squash ball is significantly smaller (4 cm in diameter, as opposed to 2.25 inches) than a racquetball ball and is made of a much more elastic rubber. The result is that a squash ball does not conserve nearly as much energy in collisions, slowing the ball down during rallies. Squash also has "out-of-bounds" areas marked around the court, especially the bottom .48 m of the front wall. This significantly changes the strategies and mechanics of the game in comparison with racquetball.