The ornamental design for a theaterbuildingstructure, as shown and described.
FIG. 1 is a perspective view of a theater building structure, showing my new design;
FIG. 2 is a reduced front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken line showing of details throughout the figure views is included for the purpose of showing environmental portions of the theater building structure and forms no part of the claimed design.