From I-35W NB:
Take I35W NB to Exit 16A downtown exits.
Use the right two lanes to exit towards 11 St.
Keep left at the fork towards 11 St.
Parking lots can be located from 3rd Ave.
Return:
To I-35W SB
From 4th Ave S, use the left two lanes to turn slightly left onto the I-35W SB ramp.