Best way to extend zwave capabilities 400' away

Trying to extend zwave coverage to a building 400 feet away. The building has wired/wireless networking, but it is too far from my Aeon Z stick that I use to control everything in the house.

What are my openremote options to do this? Tcp/ip commands to a Razberry pi to dispatch the zwave commands? Tcp/ip commands to a vera unit?

Would love to hear this group's ideas.