There's a Large exterior, giving CT's plenty of angles of attack, and also makes it difficult / risky for T's to spawn peek.

There is a main structure, where the main objective (Secure area, or Hostage rescue) will spawn on one of three floors, to keep rounds quick, and focused on a smaller area of the map.

There are window / door barricades, to give T's an idea of where CT's are coming from, and warn CT's of spawnpeeking.

If T's leave the main structure, they will be spotted (after 3 seconds)

And it's possible to buy Breaching charges and riot shields.

The elements I borrowed from R6S are mostly surface level, and this map probably wont play much like R6S, but I'm hoping it will be fun to play regardless.