Third Catio.

This is the Five Ferals' Fort and is built in a house-turned-shop in Multnomah Village.
 

Detail of wire.
 

The cats can pass from the shady part on the back half of the house to the sunny side yard using this tunnel.
 

The sunny side.  There was an umbrella (you can see the yellow in the top of this picture) to keep off the sun for the duration of the tour.
 

Here is the cats' entry to the basement of the house.
 

And a long view of the sunny area.