The singleton_030809_1815.zip file you have requested: Maps Levels Missions / Survival Maps / Left 4 Dead Survival Map Singleton House - 4.62mb is not available. Perhaps try browsing all files for the game Left 4 Dead and upload any files you want to share or are missing. This is the only information we could locate:
Designed as a highly strategic map, vent access provides faster access around the building's zones. Over 4 years of construction, originally designed for CS:S (previously unreleased), Singleton House is a replica of a College (+ additions).