Sumdac Tower (or Powell Tower, depending on who's running the show), a skyscraper in downtown Detroit, is the home of Isaac Sumdac and his daughter Sari. It also appears to be the center of Sumdac Systems, Professor Sumdac's corporation. The tower is massive, armed with impressive security features and staffed by both humans and robots. It also happens to be shaped like a giant
Sparkplug spark plug.
is was evil in that tower...evil which does not sleep.
In addition to what is presumably the living quarters of the Sumdac family, Sumdac Tower also includes Professor Sumdac's penthouse office and his private laboratory, where he keeps the severed head of Megatron as well as Megatron's severed hand—which he uses as a chair.
Whenever the tower is under attack, it engages an automatic force field to protect those inside the building. Good idea if you're under siege from the bad guys. Bad idea if the bad guy is already in there.
Sumdac Tower suffered quite a bit of damage when the Decepticons mobilized to steal the AllSpark and rescue Megatron. Starscream blew a large hole in it, Megatron burst through the roof, and the Decepticons then fired missiles at it. That's probably going to send the property values of the nearby buildings down.
Even after Megatron's rampage, the building was still under reconstruction. Mainly, it had a notable gap in the upper part of the tower.
After Porter C. Powell took over Sumdac Systems, he kicked Sari out of the penthouse and gave her room to Henry Masterson. He also informed Optimus Prime that the Autobots were no longer welcome in the tower. The tower was completely repaired by this point.