It is accessible from the garden terrace, which may be reached through the roof exit of Haymarket Mall or by traveling along the elevated highway above from the third-floor exits of Commonwealth Bank and the Congress Street garage.
The northeast corner of the terrace connects to the broken monorail that has crashed through the apartment building; the monorail cars can be reached via scaffolding on the side of the building (which does not fully connect to the street below). Several suitcases and a duffle bag are in the monorail cars near the building, while the front car includes the vantage spot for the Weathervane quest, a hostile Protectron, and a steamer trunk.
- Weathervane: Broken monorail: Tinker Tom asks the Sole Survivor to placed atmospheric sensors on high vantage points to detect any anomalies in the air.
The broken monorail appears only in Fallout 4.