Removing a Building

[fortheweekend]

Hello,
I'm beginning to get into photography and subsequently using Photoshop to enhance my photos. I've got one photo which I can't seem to find a useful tutorial for how to fix it anywhere.
Here's the link to the photo, as the file won't attach -
http://madaboutrainbows.deviantart.com/ ... /#/d3hskf8
In case it isn't obvious, I'd quite like to remove the building in the bottom right hand corner and substitute in some adequately coloured sky. Could anyone give me some advice as to how I'd go about this?
Thanks,
India

[kingdomLucy]

You can try smudging from left to right + up to bottom, brush it a bit with the same blue color and add some clouds. I'd copy some existing clouds and paste it there, erasing a bit to make it look real.
Hope I've helped