Happy to help.
I was able to import the fully textured model into Hifi.
There is no doubt there will be several ways of doing this, here are the steps I took.
Export from Sketchup as 3D model and set the format to FBX,
Once you export from Sketchup you get a .fbx file and a folder full of textures.
Run that FBX thru Autodesk fbx converter, that will produce another folder called FBX 2013 and inside that folder is the converted FBX and that the one to import into Blender.
Open Blender, import the converted FBX, then save the Blend file into the texture folder.
From the file menu on Blender go to External Data > Find Missing Files.
This will open a browser to the folder the blend file is in, where all the textures are, click “Find missing files” button.
That should associate all the textures to the materials.
You now have to play with the shaders to get it to look right…thats another tutorial.
In object mode select a single building, press CTRL/i to invert selection, now press h to hide everything except the building.
Select the building and then select each material, then select the texture to open the textures properties and put a check in "Pack Texture"
Go back to the next material and pack its texture/s, rinse and repeat until all textures are packed.
Rotate and scale the object as required then Apply/Location and Apply/Rotation and Scale.
Make sure the object is still selected and Export FBX, check Selected Objects, set path to Copy mode and put the little check in the “Pack Files” icon.
Upload the new FBX (which is our third version) to server or ATP and import into Hifi.