The ornamental design for a geodesicdomebuilding, as shown and described.
FIG. 1 is a front elevational view of a geodesic dome building showing my
new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a top view showing the roof thereof and some of the shingles
which cover the entire roof except for the five seven-sided openings
structures in the roof; and