What price progress? After slavish service to tardy Denverites for decades, the Terminal Annex Post Office is going the way of the dinosaur. The problem isn't a lack of customers: Although the U.S. Postal Service opened a fancy new downtown branch on 20th Street years ago, the Terminal Annex still has many faithful fans. Customers rely on the familiar, friendly staff, on call seven days a week; the handy parking (just don't think about parking in the lot for more than fifteen minutes, as John Elway once did: They're serious about towing); the array of postal paraphernalia that make good gifts when you're crunched for time. No, the problem is that the station happens to reside in one of the largest development sites still available in LoDo, a circa-1960 building designed by architect Temple Buell that could be sold for up to $15 million -- and turned into a development worth ten times that. Given the Postal Service's current financial situation and its inclination to close a deal on the property, it's clear we'll soon be kissing the Terminal Annex goodbye. In the meantime, mark your calendar for 11:55 p.m. on April 16, the last time you may get to watch one of the town's best free shows as frantic filers deliver their tax returns into the hands of understanding Terminal Annex employees.