The ornamental design for a buildingglass, as shown and described.
FIG. 1 is a perspective view of a building glass;
FIG. 2 is a second perspective view of the building glass; and,
FIG. 3 is a third perspective view of the building glass.
The broken lines in FIG. 1 illustrate the boundaries of the claimed design. The glass body is constructed of a translucent material that at least partially blurs an object that is located behind the glass body to a viewer looking through the glass body. Additional broken lines in FIGS. 2 and 3 illustrate the boundaries of FIGS. 2 and 3.