Actor Dylan McDermott is the newest owner of a West 21st Street one-bedroom co-op, the Times reported this weekend. A tipster points out that the apartment is #3R at 329 West 21st Street. McDermott picked it up for $701,000, a nice bit of change above the $675,000 asking price. Our tipster wonders, "Why is a successful TV actor buying a pretty small 3rd floor walk-up in a coop???" We have no idea! Was said successful TV actor in a bidding war for this third-floor walk-up? Or was he trying to use his powers for good by paying over the asking price and bringing up the market stats?