Security would have noticed quickly that there's a car blocking access to their garage. Alcohol takes a while to metabolize and stays in your system a long time. A .14 for him would probably be around 6 standard drinks. People handle booze differently but it would be shocking to me if it was just booze in his system. That doesn't add up.
It takes as little as 10 minutes for alcohol to enter bloodstream. His body should be processing about one drink (.02) an hour.
Even if he did his last shot as he was walking out the club door, by the time he got to the car, that shot has been absorbed.
If there was an alert parking garage attendant who quickly noticed situation and called cops, that's a few more minutes and then one hour of cops trying to wake him up. Add in the time of getting him out of his car and in to cop car and then the time to administer test........
Book was close to a .18-.20 when he got in the car.