Rōmon

Its otherwise normal upper story is inaccessible and therefore offers no usable space.

It is in this respect similar to the tahōtō (a two-storied pagoda) and the multi-storied pagoda, neither of which offers, in spite of appearances, usable space beyond the first story.

[3] This extremely common single-roof gate was developed from the double-roofed nijūmon, replacing the flanking roof above the first floor with a very shallow balcony with a balustrade that skirts the entire upper story.

[4][5] Therefore, while the nijūmon has a series of brackets (tokyō) supporting the roof's eaves both at the first and at the second story, in the rōmon at the first floor these brackets just support the balcony, and have a different structure.

[6] The tokyō are usually three-stepped (mitesaki), but at the first floor they lack tail rafters.