Sources: NBA set for 1st vote in Las Vegas-Seattle expansion
www.espn.com
The NBA will hold a vote at the board of governors meetings next week to explore adding expansion teams exclusively in Las Vegas and Seattle, sources told ESPN.

23/30 owners need to vote yes.

This vote is to allow the league to get bids from Seattle and Las Vegas specifically.

Then once the bids have been received another vote later this year would occur to approve those.