The instructor of the multiengine airplane reported that he and the student pilot had intentionally shutdown and secured the right engine for training purposes; however, they were unable to get it restarted. The instructor then flew the airplane back to the departure airport and extended the landing gear while on a 2-mile left base leg of the airport traffic pattern for runway 14. After the landing gear was extended, the instructor noticed a high descent rate and subsequently raised the landing gear, which arrested the descent. At that point, the tower controller reported that the wind was from 130 degrees at 20 knots, gusting to 35 knots. The instructor extended the landing gear again when the airplane was established on final approach at the proper glidepath, but the descent rate again increased and the wind started to gust on short final approach. The airplane subsequently touched down prior to the approach end of runway 14, in a grass drainage basin of a perpendicular runway. During the landing, the right wing struck the ground and the nosegear collapsed before the airplane came to rest upright in the basin. With the exception of the inability to restart the right engine, the instructor did not report any preimpact mechanical malfunctions with the airplane. Examination of the airplane by a Federal Aviation Administration inspector revealed substantial damage to the right wing and fuselage. The inspector did not observe any preimpact mechanical malfunctions.