Guess if I read further down on the details link. Site indicates Pre-Construction for these condos. Many builders offer properties in advance. A Buyer's Agent can still represent your best interests when purchasing new construction.
I also suggest having a local real estate attorney review all contracts before signing.
Real estate professionals will have this information. Most MLS's now list two numbers. DOM days on Market with current Realtor(R) and TDOM total days on market if with more than one.
Your Buyer's Agent would be able to provide more information than the 180+ days on Trulia. If you are not under contract or obligation with an agent, I can recommend some. A Buyer's Agent is required to represent your best interests in a real estate transaction. If you would like a sample form, I can email one to you no obligation.