On page 22 of a public warning siren contract on Denver's official website ( http://www.denvergov.org/sirepub/cac...2014246882.PDF
it clearly shows Denver's 911 Backup Center at 303 W Colfax St as Matt (f0urtyfive) and Bill (ScanDenver) have already said.
"Base Stations and Control Consoles:
The system shall be activated from three control consoles located at the following sites:
1. Denver 911 Dispatch Center at 950 Josephine St, Denver, CO 80204.
2. Denver 911 Back-up Center at 303 W Colfax St, Denver, CO 80202.
3. Denver Emergency Operations Center at 1437 Bannock St, Denver, CO 80202."
I believe the "2524 South Grapevine Road, Idledale, CO" location that Shawn (ScannerSK) guessed is actually the address at the Red Rocks repeater site (aka Mount Morrison)... or at least it is very close in proximity.
As far as the 900 sq ft, I may have quoted Carl Simpson (executive director of Denver 9-1-1) wrong on that. I think he meant that the Denver 911 location used before the 950 Josephine one was in a boiler room and shared by OEM in a municipal building built in 1930. Everything he said was meant for public consumption and he never said the official ROC location (like the 2012 contract above does). What did they use before Josephine?