The Baltic was built using techniques that would protect the trees as much as possible. For instance, no large machinery was used around the trees, which can damage the water-absorbing surface roots significantly. Instead, a complex system of rigging was used so that large supports and pieces of materials were swung into by hand-pulled ropes.

The structure also sits on a platform 13 feet off the ground that is supported by specialized hardware that is attached to the trees. The platform also serves as a small outdoor deck, including an area that functions as an outdoor shower, hidden by the tree trunks. For this project, the supporting trees were located outside of the treehouse envelope, as the cold climate meant it would have subjected the trees to huge differences in temperatures if part of their trunks were inside the house.

Additionally, there is an insulated conduit where plumbing and electrical wires run up to service the treehouse.