The north half of the downtown block bounded by Forest Ave., Cumberland, and Casco is a "telco hotel" owned by Fairpoint - a complex of large buildings filled with telecommunications equipment and servers. I don't think that the microwave tower on top has an official name, but it's a local landmark and deserves to be called something. The Bayside Brainmelter? The Dishrack? Please leave suggestions in the comments.
Inspired by Burrito Justice's animated GIF of the Sutro Tower.