Long Mansion is an older high rise building built in 1965 situated conveniently on Caine Road, the main thoroughfare of the Mid-levels. Caine Road is where all amenities, including supermarkets, convenience stores, pharmacies etc. can be found. A bus stop is found right in front of the building. To get to Central by foot, you can either take a shortcut by taking the lift down to Arbuthnot Road in the next door commercial building, Universal Trade Centre, or the public staircase next to Universal Trade Centre or by taking the Central-Mid-levels Escalator.

Long Mansion consists of a single 24-storey with 2 units per floor. The size of a typical apartment is 1,623 sq.ft. (saleable).