Manhattan Beach breakfast for 30 people
The Marmalade Cafe in El Segundo Plaza has ample room and parking for a party of that size.
Food is so-so, but they have some interesting omelletes.
You can also try Sharkeez if its on a weekend. They have enough space for 30..never been for breakfast but they do have some good bar food....i would imagine the breakfasts would be pretty decent.
Maybe Indoor at Henesseys they could gave enough tables for 30 too. The Kettle may be too busy to be able to block off 30 people.