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it is approx 37.5 inches in the very middle of the very middle from front to back.
however on the UL on the right half hanging down about 6 inches from the top is the built in rear air purifier thing that also sits out about 6 inches as well and is sortof a nuisance.
Your wife going to ride in the back mostly? If you worried about space, get a CL, has almost everything you'd need for driver and front passenger.
She has to ride up front - where there is less motion sickness and I can control the seat heater. She doesn't sense the seat getting too hot. One of my purchase requirements is the heated seat controls on the center console rather than the door. A CL with a black semi aniline interior is my target vehicle. Otherwise, a ML with black or cashmere. I could live with a CL with ecru, but I prefer a bit darker interior.
BTW, North Hills Lexus in Pittsburgh has a nice looking UL (that was originally from near me in Michigan).