Prop. Code Section 82.052
(1)if walls, floors, or ceilings are designated as boundaries of a unit, then all lath, furring, wallboard, plasterboard, plaster, paneling, tiles, wallpaper, paint, finished flooring, and any other materials constituting part of the finished surfaces are a part of the unit, and all other portions of the walls, floors, or ceilings are a part of the common elements;
(2)if any chute, flue, duct, wire, conduit, bearing wall, bearing column, or any other fixture is partially within and partially outside the designated boundaries of a unit, then the portion serving only that unit is a limited common element allocated solely to that unit, and the portion serving more than one unit or the common elements is a part of the general common elements;
(3)subject to Subdivision (2), the spaces, interior partitions, and other fixtures and improvements within the boundaries of a unit are a part of the unit; and
(4)shutters, awnings, window boxes, doorsteps, stoops, porches, balconies, patios, and exterior doors and windows or other fixtures designed to serve a single unit, but located outside the unit’s boundaries, are limited common elements allocated exclusively to that unit.
Section 82.052 — Unit Boundaries,
https://statutes.capitol.texas.gov/Docs/PR/htm/PR.82.htm#82.052 (accessed Dec. 2, 2023).