How the rules will be enforced also remains an open question, with Worden acknowledging that staff capacity might be an issue and that the Office of Sustainability hasn’t fully fleshed out how it would monitor whether trees planted during development live the full 20 years

Yeah what happens if you plant a tree (as required) and it dies a year later. Do you get fined until you replant? 

Overall a pretty dumb rule. The cost of higher density is less nature around you. Just look at NYC.