The Round-Up: Tuesday

The Donald says that the New York real estate market could change “at a moment’s notice.” [CNBC]

MTA looks in to rail link between Penn Station and Stewart International Airport. [NY Sun]

Manhattan-based start-up licenses real estate data to Wall Street firms so that investors can now bet on residential real estate markets. [Crain's]

New management at Chelsea Hotel wants you to know that occupancy is way up. (Last item) [NY Post]

Archstone-Smith buys apartment tower at 303 East 83rd Street for $170 million. (Last item) [NY Post]