The zone building ID can be found in the xml feed, under "type=".
This is the xml for the Nuclear Bunker:
<zone x="26" y="19" nvt="0" danger="3">
<building name="Nuclear Bunker" type="10" dig="0">
The number has been partially worn away, but this was in all likelihood shelter number 14. Judging by the crumbling bodies inside, the airlock system couldn't have worked as expected. Shit happens.
</building>
</zone>
Q: How did we figure out the gif images for the ruins? --Tamle 01:15, 24 November 2011 (PST)
The are nicely ordered as frames within a sprite in the flash, which I dismantled. 
Discordance 12:05, 24 November 2011 (PST)