The City of Bellevue's Land Use Review Desk states that the 41.5 neighborhood is not considered a Planned Unit Development, because it wasn't annexed by Bellevue until 2001. They checked King County records and didn't see under language from our original plat indicating that it was a KC PUD:
http://www.41point5.org/docs/plat_survey.pdf

The Land Use Review Desk said that Bellevue does consider it a standard subdivision, with lots that equal or exceed the minimum lot size required by City of Bellevue zoning.