Contemplating Condo Purchase?

I decided to check out a pre construction condo project. It's very close to Boston, actually right in Cambridge. I really had no intention of making any purchase, but I was really impressed with the project. Here's the web site: click here. I put down an initial deposit of $2,500 to hold the unit and I have ten days to opt out. It's a nice little 800 sq Ft duplex. There are the pros and cons. I would have to do some big time portfolio adjustment. I will put at least 20% as a down payment, but that means liquidating a chunk of my portfolio. I hate these kind of decisions... Ugh...