The phrase "a rectangular structure" is correct and usable in written English.
You can use it when describing a physical object or architectural design that has a rectangular shape.
Example: "The architect designed a rectangular structure that would serve as the new community center."
Alternatives: "a rectangular building" or "a rectangular form".
INSIDE: The house — a rectangular structure with a corrugated metal face — was built in 2008 by its current owner.
Its essential components were a rectangular structure, terraced porticos, a series of pillared ambulatories, an open court, and a hypostyle hall tucked into the cliffs.
We dipped into the adjacent maze of alleys and saw Hung's childhood home, a rectangular structure of brick with a courtyard in the middle that, like most such houses, has seen better days.
A novel approach to investigate the modal density of a rectangular structure in a wide frequency range is presented.
First, the sensors were tested on an experimental site where a rectangular structure with limited dimensions was dug in a sandy soil.
The paper seeks to examine hydrodynamic coefficients of a rectangular structure in shallow water and to establish analytical formulae for fast computations.
Then the proposed numerical model is used to obtain flow results for the following free surface flow cases: (i) interaction between two opposite solitary waves, (ii) seiche phenomenon in a rectangular reservoir, and (iii) solitary wave through a submerged rectangular structure in a viscous fluid.
A larger rectangular structure with an east-west alignment, identified from postholes left in the ground, stood on the east side.
The third design looks from afar like a giant abacus; it is a transparent, rectangular structure with ramps allowing visitors to walk up toward the top to get a better view of the site of the twin towers.
Grosvenor, an urban refuge of social service and education programs housed in a bleak rectangular structure that looks more like a compact jail, had been brought into discussions over how to spend $205,000 in amenity financing that had been promised by a developer constructing a high-rise condominium at 84th Street and Broadway.
Three roofs, for there was a tall rectangular structure met on each end by a semicircle.
