|Basically you can't.|
The Maximum length for a an Ethernet link between two devices is 100 meters (328) feet. To run an Ethernet cable over that kind of distance you would need to install a repeater every 300 feet. 1000 feet is beyond the capabilities of Wi-fi, even without the trees.
If both these building have an Internet connection you can link them together via VPN (Virtual Private Network) which goes via the Internet.