Box-like

This series of buildings looks like an ancient home for kings. Huge rounded and box-like buildings have windows in the shape of circles and triangles. The structure is surrounded by water. From a distance, it appears to float on a lake. Kahn spent the last twelve years of his life on the project. It was completed in nineteen eighty-three, nine years after his death. Because of Kahn, experts say, one of the poorest countries in the world has one of the most beautiful public buildings on Earth.

Source: tatoeba (12261183)

Once inside it widens, but only to make room for a big box-like building with the worn and greasy look of the slum tenement that is stamped alike on the houses and their tenants down here, […]

Source: wiktionary

The majority of locomotive bodies have vertical sides, partly to simplify construction and partly to make the utmost use of the permissible loading gauge. This tends to produce a box-like appearance, which is uninteresting in itself but can be improved [...].

Source: wiktionary