We lost a tree in my neighborhood during the storms last month. It was a large tree that provided shade for the nearby tennis and basketball courts. It will take decades for a new tree to provide that benefit for the park. But as a forward-thinking community, we plant trees now knowing that they will provide shade in the future.
This is an apt metaphor for housing affordability. We need to build new housing now so that we have older homes that will be affordable for middle-income families in the future. Therefore, when we evaluate our zoning policy or a site plan, we shouldn’t only judge it by the cost of the new housing that will be produced, but also on the cost of the older housing that it will become.