@kfogel @kevin Ok I was slightly wrong: https://www.nyc.gov/site/buildings/property-or-business-owner/energy-grades.page
Interesting grading scheme, where "D" is the worst score you can get if you submit any information and F means "no information", with an extra grade, N, which also means "no information" but this time it is OK because they were exempt from providing information.
A few more steps and those quiet and signaling NaNs can evolve like IEEE floats and there will be more "no information" grades than stars in the universe 😛