VANISHING POINT CLONING
Use this filter to clone along the perspective of an object.
The ‘Vanishing Point Filter’ found under the Filter menu  lets you clone in perspective. Here you can use it to clone over the awnings  and tidy the face of the building, using the nearer building details as a source . This wouldn’t be possible with the conventional Clone tool due to the perspective of the building, but with the Vanishing Point Filter, it’s quite a simple job. Click on four corners to plot out a plane over the rectangular face of the building using the Create Plane tool , then grab the Clone tool . Use the settings at the top of the dialog  to resize the brush tip, then Alt-click to define a nearby source before cloning over the awnings to remove them.