Foursquare gets its 100 millionth check in, moves into new offices.

It’s one of those “aw look, they’re all grown up” moments. As Foursquare quickly pushes its way past anyone else in the location game, the little business that could is truly coming into its own.

Yesterday Tristan Walker, the business development brain behind Foursquare took the opportunity to announce the 100 millionth check-in via the service.  Today, we get a look at the new Foursquare offices in Soho via the Flickr account of dpstyles:

With that many check-ins, and the new offices to boot, things are clearly going right for Foursquare. How right, of course, is the question. The business appears to be on a promising upswing, with $20 mm in new funding and a total valuation that now surpasses $100 mm.

The proof, it’s said, is in the pudding. And this pudding is in a box that’s clearly labeled Foursquare. The vast majority of new location-based applications have Foursquare integrated, or they’re trying to be Foursquare. If imitation is the best form of flattery, then Foursquare has to be feeling red-carpet glamorous at this point.

What’s next for the company? Details are somewhat sketchy at this point, but you can be sure that we’ll start seeing more Foursquare window clings popping up worldwide. Will one show up on a Soho office door sometime soon? Most likely.

We’ve reached out to the Foursquare crew to see about getting some details on the rather lovely new digs.  We’ll let you know what we hear, of course.