Meanwhile, staff at the diner said it is preparing to become a full-service restaurant. Staff members told the newspaper that the transition to full-service would happen "soon."
"I am leaving the Tesla Diner project to focus on the opening of Mish, my long-desired Jewish deli," Greenspan wrote in a text message to The Times. "Projects like Mish and the Tesla Diner require a sharpness of focus and attention, and my focus and attention is now squarely on Mish."
Optimus robot serves popcorn at opening day of Tesla diner
Earlier this month, Elon Musk won a shareholder vote that would give the Tesla CEO stock worth $1 trillion if he hits certain performance targets over the next decade. The vote followed weeks of debate over his management record at the electric car maker and whether anyone deserved such unprecedented pay, drawing heated commentary from small investors to giant pension funds and even the pope.
In the end, more than 75% of voters approved the plan as shareholders gathered in Austin, Texas, for their annual meeting.
"Fantastic group of shareholders," Musk said after the final vote was tallied, adding "Hang on to your Tesla stock."
The Associated Press contributed to this report.