Re: the nest box. Mck. bld. consists of a lower building (six stories) with a roof and a parapet and right behind and attached another taller building about another six stories, the nest box is about 30 feet up above the lower building. They use a 30 foot ladder on banding day to reach the nest box. This makes this nest box a pretty safe place for fledging because of the roof below. Please note these are only approximates but are pretty close.