After landing about 30 minutes after sunset, the pilot taxied off the runway onto a perpendicular taxiway and was instructed by the ground controller to “taxi to the ramp.” The pilot observed the FBO directly in front of him and proceeded straight ahead, exiting the taxiway and continuing down a grassy slope between the ramp and taxiway. During the excursion from the taxiway, the propeller and the tail of the airplane struck the ground, resulting in substantial damage. The pilot did not report any mechanical malfunctions with the airplane.
