Download the map here.

The beautiful mansion, the beautiful mansion.
duh-da-dun
The beautiful mansion, the beautiful mansion.
duh-da-dun...

The goal I set out to achieve with this map was a truly open-ended gameplay experience. Most maps suffer from the fact that the majority of their rooms are accessible in very few ways, most of which aren't even entertaining. Aside from two rooms on the ground floor of the mansion, I strove to make every room have multiple interesting entrances and exits. I used fence walls for the ceiling/floor between the first and second floors to help give the map a more open feel, and allow for multi-level fire fights.

This map has been catered to FFA gametypes, though any gametype is technically playable on it. I personally recommend Team Slayer, FFA Slayer, and Juggernaut (poor stealth camo for players: Hide and Seek!). Pictures and full item details are below.

_________________________________________________
Picture Gallery - Click images below for full-sized versions.

Front View of the Mansion: You can see the mancannon that launches you up the the roof, the front door, the two garages, and one of the defensive turrets (it's upside down, look closely under the lip created by the roof).
http://www.saleagues.com/halo3/main.php?g2_itemId=150&g2_imageViewsIndex=3
_________________________________________________

View of the Living Room: You can see into one of the garages, the front door, the sword hearth display, and the lights on the ceiling. This is the most open and accessible room in the house with 4 entrances.
http://www.saleagues.com/halo3/main.php?g2_itemId=190&g2_imageViewsIndex=3
_________________________________________________

Looking down on the first floor (Active Camo room) from the first floor (Brute Shot room). The stairway to the roof is accessible through the hallway the blue player is looking down on the second floor.
http://www.saleagues.com/halo3/main.php?g2_itemId=140&g2_imageViewsIndex=3
_________________________________________________

Looking down on a Blue player on the first floor (Living room) attacking a Red player on the second floor (Shotgun room).
http://www.saleagues.com/halo3/main.php?g2_itemId=170&g2_imageViewsIndex=3
_________________________________________________

Looking into the mansion from the back door: This is what you see when you enter through the house through the rear door. You can once again see part of the sword display in the living room. Stairs were used instead of bridges and fence walls were used instead of regular walls to increase visibility (and vulnerability) inside the mansion.
http://www.saleagues.com/halo3/main.php?g2_itemId=205&g2_imageViewsIndex=3
_________________________________________________

Location of the Grav Lifts: Two Grav Lifts are located on either side of the mansion's back door.
http://www.saleagues.com/halo3/main.php?g2_itemId=230&g2_imageViewsIndex=3
_________________________________________________

Grav Lift assisted entry to the second floor: The gaps present in this hallway are to allow access to and from the ground level. This really neat feature came to be when I ran out of all forms of walls.
http://www.saleagues.com/halo3/main.php?g2_itemId=235&g2_imageViewsIndex=3
_________________________________________________

Back corner of the roof: You can see the double mancannon setup that launches players from the shotgun room on the second floor to the roof in this picture. Also, the bubble shield and stairway access to and from the second level can be seen.
http://www.saleagues.com/halo3/main.php?g2_itemId=210&g2_imageViewsIndex=3
_________________________________________________

Another view of the roof: Here you can see the stairway between the second floor and the roof.
http://www.saleagues.com/halo3/main.php?g2_itemId=185&g2_imageViewsIndex=3
_________________________________________________

Blocked off: The entrances to the traditional bases in Foundry have been blocked off. Grav Lifting up to the ledges is possible, but leaves you very vulerable (see below).
http://www.saleagues.com/halo3/main.php?g2_itemId=225&g2_imageViewsIndex=3
_________________________________________________

Rocket Launcher corridor: I used the ducting present on the level to create a tunnel to the Rocket Launcher. Risk versus reward indeed.
http://www.saleagues.com/halo3/main.php?g2_itemId=220&g2_imageViewsIndex=3
_________________________________________________

Grav Lift accessible: Using a Grav Lift to reach the roof isn't just fun, it's encouraged. Unfortunately for our friend here, his enemies were also able to make use of his get away Grav Lift.
http://www.saleagues.com/halo3/main.php?g2_itemId=165&g2_imageViewsIndex=3
_________________________________________________

Weapons placed on map:

2 x Sword (no respawn)
2 x Turret (no respawn)
1 x Rocket Launcher (180s respawn)
1 x Sniper Rifle (180s respawn)
1 x Spartan Laser (180s respawn)
2 x Mauler (120s respawn)
1 x Shotgun (120s respawn)
2 x Battle Rifle (120s respawn)
2 x Carbine (120s respawn)
1 x Needler (90s respawn)
1 x Brute Shot (90s respawn)
2 x SMG (60s respawn)
2 x Spiker (60s respawn)

_________________________________________________
Equipment placed on map:

1 x Active Camo (180s respawn)
1 x Bubble Shield (180s respawn)
2 x Grav Lift (60s respawn)
4 x Frag Grenade (60s respawn)
4 x Plasma Grenade (60s respawn)
4 x Spike Grenade (60s respawn)
1 x Firebomb Grenade (60s respawn)

_________________________________________________
I also wanted to thank Ed (lenocinor) and Dave (Arafa) for their help with this map. I may have forged it, but without your criticism and ideas it would have been far more bland.