I have driven by this location for years. It has a couple unique landmarks right near by that those who travel up and down highway 26 will easily recognize. This should be an easy park and grab on your way to or from Mt. Hood. There are a few cools spots a cache could be right here so I hope your GPS is calibrated.
I am not a history buff or I could tell you more about the large cone building that is near the cache. If anybody has the details, please leave them in your comments
-- Update Thanks to Dasindog "The structure is a wigwam burner. They burned ‘waste’ from sawmills and used to be seen everywhere."
When you finish, have some fun in Sandy and visit some of the local watering holes.
*Cache Not At this Building. Here for interest sake only 
Parking Help:
Please pull all the way off hwy 26. There are a few spots you can park that are nearby, yet out of the way.
Congrats to FinnFinders78 for the First to Find!