|SU wireframe of 538 Johnson Ave.|
|Shaded model without texture mapping|
|Fully textured model of 538 Johnson in Sketchup|
You gotta design your building's shape (the basic massing) before you can lay on the textures (photographs of the actual building.) Submit it to Google Earth – if it's built correctly they'll accept it, and your building will become part of the user experience of everyone who uses Google Earth!
If there is a model which currently exists of the building you want to make, if you make a better one (the criteria are accurateness, economy of mass, and file size) it will replace the less awesome model.