Whats happening with the Jedi temple now that all the Jedis are dead. Here are 3 (4) possibilities:

1. A military base
Maybe the emperor decided it was big enough to transform it into headquarters of the imperial army.

2. An appartment block.
Transform it into a Deluxe appartment block to make Credits faster for the new empire.

3. He destroy it an keep the metal to build the Deathstar.

(4. Dexter buy it and start a restaurant empire).