measure from ground to the bottom of the headset lower cup... then let air out of the tire until the bike's top tube looks level... re-measure... there's the difference you'll need to level the bike...
also... use either a machinist' protractor or a cell phone angle app to check the head tube angle with the bike in the "lower tire pressure " stance... see if that spec matches the bike spec. as called out by Cannondale... adjust if needed. Re-measure the ground-headset cup distance... do the math, find your new fork. Don't forget to consider needed Tire Clearance in the vertical direction...

oh, and that sidewalk is not level to the wall's grid...