There are also several hotels very close to the start line that also offer parking at their location. You can contact the hotels directly to see their rates or check the link above to see what is offered.

Hampton Inn & Suites - Directly Across the street from transition
TownePlace Suites by Marriott - Directly Across the street from transition
Homewood Suites by Hilton - Near Liberty Station - short ride or walk across the footbridge and under N. Harbor Dr.
Courtyard by Marriott - Near Liberty Station - short ride or walk across the footbridge and under N. Harbor Dr.