digital retouch photo

I have a photograph where I would like the power-lines across the tin face o the building edited out, and the end result appear seamless. Photoshop re-touchers.. this is your project. When done, the full front face of the building should appear, but without the power-lines - it should not be noticable under casual inspection that the power-lines have been removed.. it should look seamless. Attached is the file to be edited. Jeff