This is Black Mesa from Half-Life 1 (Source) and this map shows the main area of the map and it contains all of the corridors of the Black Mesa Facility.

It's mainly a Team Fortress 2 map it has the regular control points and in the right positions so both teams can get to them in a fair fight.

You will mainly require Team Fortress2 since it using props and models from the game plus textures.

If you use this map without Team Fortress 2 content then you will suffer with alot of error models appearing on the map and horrible slowdown and the dreaded Black and Purple checkerboard textures.