Upgrading Sheds beyond level 20

What am I missing in this scenario? I have upgraded my Lumber Shed to max 20 level and see no further upgrade path except for Building Pantry. Building Pantry, however, requires Quarry lvl 2 first, but I have no resource in my territory or anywhere near available to quarry. 

Upgrade of Residence to level 10 requires more logs than current Lumber Shed can hold, and I need Residence 10 to seize Copper at the corner of my territory that is now partially in a neighbor's territory.

The prerequisites are sometimes very frustrating to the point of not having fun with this any longer.  

The quarry if for the stone at your towns. It's the update of the stones fields. I hope that helps you :)

What am I missing in this scenario? I have upgraded my Lumber Shed to max 20 level and see no further upgrade path except for Building Pantry. Building Pantry, however, requires Quarry lvl 2 first, but I have no resource in my territory or anywhere near available to quarry. 

Upgrade of Residence to level 10 requires more logs than current Lumber Shed can hold, and I need Residence 10 to seize Copper at the corner of my territory that is now partially in a neighbor's territory.

The prerequisites are sometimes very frustrating to the point of not having fun with this any longer.  

As indicated, stone fields get promoted to quarries, so you do have the resource in your towns.  Promote a stone field to a quarry (after appropriate research) and upgrade to level 2, and voila, you will have your ability to build a building pantry.  Provided, at least one of your forestries has been promoted and upgraded to a level 2 felling.