According to a promotional booklet published in 1899, it was constructed 25 feet from its adjoining apartment block, The Dunvegan, with which it connects via an underground passage. Both buildings are of the same height and similar size (six stories in height, with a frontage of eighty-five feet), built of the same materials, and with a similar architectural appearance, although the Montrose's floorplan is roughly rectangular but the Dunvegan's is triangular. The Montrose's vestibules, front hall, and stairway are finished in Sienamarble, mahogany, and mosaic floors. Each of its twelve suites originally consisted of ten rooms and a bath, as follows: parlor, reception-room, library, dining-room, four bed rooms, kitchen and servant's room, bath room, servant's water-closet, and butler's pantry.
When constructed, the building was wired for door bells and electric lights, and piped for gas and hot and cold running water. Heating was provided by low-pressure steam.