The investment of embodied carbon made to construct existing buildings can be preserved by threading a new structure through the existing frame. If the newly introduced system is a post and beam structure, the two structures can co-exist with independent construction and renovation timelines. The predictable new construction costs can support new revenue streams, priming the more expensive restoration of the historical building below. Traces of the addition above can also be experienced below even during the raw unrenovated state further reinforcing the independence of the two construction timelines. Repetition of this scheme over varied historical buildings below will create an undulating rhythm of new construction above.