well I went back and found a few of them.
the shittastical renderings of the now defunct 1PP design:
Notice the pyramidal roof, the old version of 1441, and the imaginary skyscrapers I placed at 11th and market.
Another horrible rendering of 1PP, with the old versions of both RATR and 1441.
and now for Comcast Center:
My favorite, based off a sasso photo, with CC, the Murano, and a blocked in Mandeville Place.
A rough sketch of CC from the north, heading southbound on I-95.
A sillhouette view including Mandeville, Murano, CC, the old RATR and the old 1441.