The Quakes sent their first round pick (15th overall) and allocation money to the Crew in exchange for Lenhart, who grew up in Yorba Linda, Calif.
With their second round pick (33rd overall), the Quakes selected midfielder Anthony Ampaipitakwong from the University of Akron.
"Steven is a young player at only 24 years old, but he has three years of experience in MLS," said General Manager John Doyle. "He is a big forward who is difficult for defenders to handle. We think he can come in and help bolster our attack."