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"City Streets" is an urban map built around the idea of a city block. Each building is enterable, and most have several floors with lots of windows to shoot out from. The entire street level is raised above the ground, so you can actually move from building to building using this underground route if it gets too crazy above (the underground area is also a great spot for losing a pursuer while in a vehicle).

The map was built with team slayer in mind, but I've taken the time to add all gametypes so you have some different options. Each one plays slightly differently because I placed objectives in different locations. In the Invasion mode you can even blow up a few of the buildings, removing part of their geometry. Since there are few weapons on the map I'd recommend setting up some custom classes. Here are a couple gametypes you can use for this map:

Team Slayer:
Bungie.net : Halo Reach : File Details
Invasion:
Bungie.net : Halo Reach : File Details
One bomb Assault:
Bungie.net : Halo Reach : File Details

I realized some people would like to tweak the map with changes they'd like to see. To help accomadate that I made a version of the map with a slightly less expensive large building, and used the extra money to throw down some cover. At any rate this could be considered an alternate version:

Bungie.net : Halo Reach : File Details