This photo used the Vanishing point filter in Photoshop CS5. There was an window air conditioning unit in one of the windows. The unit did not really fit the photo I was intending, a black and white and emulating how the mansion must have looked in years past. I used the vanishing point filter and cloned out the air conditioner, then completed the B&W conversion with Topaz Black and White effects which also added a bit of grain. There was also a bit of burning and dodging to open up the shadows and darken some of the highlights.