Hi Ali,
You know how they say whatever goes up must also come down? Well, it's not true for property prices. I have been observing the prices of property in some of the areas in Islamabad and Lahore and they've been constantly rising. Part of it is also because of inflation but apart from that, property prices are generally on the rise in both Lahore and Islamabad.
About B-17, if you are asking then it is one of the hottest upcoming projects in the capital city. Once you take out big names like DHA or Bahria Town then, roughly speaking, B-17 is either the second or the third most popular project and does seem to have a bright future. It is indeed an excellent choice for investment. So go right ahead. :)