These are pictures of the Sapphire building being under construction. I went to 4. Levent station both in December 2009 and June 2010 to inspect progress. Essentially a tall box it get flair from two flaring constructions on either side. I found some further information, that is:

"Sapphire skyscraper, currently in its final stages of completion, is expected to become a site of attraction for some seven million tourists who visit Istanbul each year. The building will include a new shopping center called Sapphire Carsi, focusing on local design, patterns and traditions, giving the second-highest building in Europe an authentic Turkish touch.
The mall will have 134 shops in 30,500 m˛ of rented retail space next to the metro station in the city’s 4 Levent district.

Nahit Kiler, Chairman of Kiler Holding which owns Sapphire, envisages the complex becoming one of the main centers of attraction in Istanbul. The 300-meter-high building is the highest in Turkey and the second-highest in Europe. Its scenic terrace located at a height of 236 meters, likely to host an up-scale restaurant and a nightclub, will be the first of its kind in Turkey. "