Rush Hill, the one incumbent up for re-election this year on the Newport Beach City Council, has lost his seat to challenger Duffy Duffield.
Duffield was leading Hill by 67 to 33 percent as of early Wednesday, with all precincts reporting.
And a controversial ballot measure to allow development near Fashion Island was shot down by 70 percent of the electorate, according to the Orange County Registrar of Voters.
Meanwhile, candidates Diane Dixon, Duffy Duffield, Kevin Muldoon and Scott Peotter have won council seats.
Measure Y would have allowed the Irvine Company to build 550,000 feet of commercial space and 550 residences near Fashion Island instead of building in Newport Coast.
The proposal had raised concerns about increasing traffic on already-congested roads like Pacific Coast Highway and MacArthur Blvd.
Others argued that the Irvine Company would be relinquishing their right to build at another site in Newport Coast.