The Orange County California website isn't as informative as the Orange County Florida website, so it's hard to tell what units are where, or how many units have been declared. But, fwiw, in Florida, a unit may consist of 1 or more rooms. At SSR for example, a unit was usually 1 GV, or 2 to 4 2br's. At BLT, a unit so far is usually 1 GV, or 1 to 2 2br's.
Also, UY would have a bearing on what unit is assigned.
btw: my docs dated March 25 have me in unit 1, and I have a June UY.