If you tried to explain "Diamond Jamboree" to someone who last ate there in 2024, you would be lying by omission. The parking is still the same fight it always was. But the restaurant lineup has been rebuilt around a single obsession that didn't exist here two years ago: all-you-can-eat wagyu, sold at four different price tiers, by more than one company, at more than one address, along the same stretch of Alton Parkway.
Tokyo Table is gone. In its place, since December 2025, sits Chubby Cattle BBQ, a Las Vegas-based chain's flagship AYCE concept done up with Space Invaders and Pokemon marquees, marking Orange County's first location of the format. Further down the same corridor, in Westpark, Mikiya Wagyu Shabu House opened in October 2025, and reviewers who've tried both call it a genuine coin toss against Chubby Cattle for the better meal. Both are owned by the same parent company. Neither charges the same price for its top tier. That gap is the most useful thing anyone can tell you about eating here right now, and it's the kind of detail you won't get from a shopping center directory.
The wagyu math nobody advertises
Here's what the same restaurant group charges for its highest AYCE tier at two locations on Alton Parkway:
| Restaurant | Address | Top tier price per person |
|---|---|---|
| Chubby Cattle BBQ | Diamond Jamboree, 2710 Alton Pkwy | $88 (diamond) |
| Mikiya Wagyu Shabu House | 3745 Alton Pkwy, Westpark | $98 (diamond) |
Same ownership group, same street, ten dollars apart at the top tier, and that's before Chubby Cattle's newer $98 platinum add-on, which layers in dry-aged full-blood wagyu tongue as a special two-per-person item. Mikiya's lower silver tier starts at $55, Chubby's starts at $58 after a recent round of price increases across all three of its original tiers. None of this is posted anywhere you'd see it side by side unless you've eaten at both, which is exactly why most people default to whichever one has the shorter line that night rather than the better value.
The competitive pressure is real, and it's fast. In the space of about a year, this stretch of Irvine went from having zero Japanese BBQ options to three: Chubby Cattle, the earlier Wagyu Factory concept that opened in Tustin and Lake Forest during summer 2025, and a third entrant, 7 Japanese BBQ, that has already closed. That's the churn rate you're actually dealing with when you plan a Friday night around "the new place." Some of these new places don't make it to their second anniversary.
Mikiya isn't technically at Diamond Jamboree, and that's the point
Ask a longtime resident where Diamond Jamboree ends and they'll point at the H-Mart parking structure. But the restaurant that's arguably the best addition to this corridor in the past year, Mikiya, sits at 3745 Alton Pkwy in Westpark, not inside the original 2700-2750 Alton Pkwy footprint that most people mean when they say "DJ." The dining scene that made this intersection famous has stopped respecting its own property lines.
That matters if you're deciding where to go on a given night, because the mental map most residents carry, the parking lot behind H-Mart, the plaza with Haidilao and Kura Sushi and the Meet Fresh flagship US store, is no longer the whole story. The interesting expansion is happening along the corridor, not inside the original center's four corners. If your search is limited to what's physically inside Diamond Jamboree's leasing footprint, you're missing the better shabu-shabu.
The plaza people call "DJ" was never really one building. It was always a corridor that happened to have a good parking structure at its center. The last two years just made that obvious.
The expansion everyone's been waiting on is still stuck in entitlement
The other piece of news, and the one most likely to actually change how crowded this place feels, has been moving slower than the restaurant openings around it. In August 2024, Irvine's Planning Commission unanimously approved a Conditional Use Permit and Master Plan Modification to expand the center: a six-story parking structure wrapped in 23,000 square feet of new retail and restaurant space, with a two-story building planned for the southeastern side near Millikan Avenue and the parking structure itself facing Alton Parkway.
The project's own architect, KTGY, describes it as something that started as a straightforward fix for the parking shortage and grew into a full retail building once the demand from prospective restaurant tenants made a plain parking garage look like wasted square footage. The tenant wishlist floated for the space includes high-end sit-down restaurants, a pop-up taco concept, a juice bar, a wine bar, and Indian and Korean BBQ.
Two years after that initial approval, the project is still working through city review. A separate Conditional Use Permit filing tied to retail space at Diamond Jamboree appeared on Irvine's list of active discretionary projects as recently as March 2026, with no completion date attached. If you've been holding off on visiting until "the new building opens," there's no evidence that's imminent. Plan around the parking that exists today, not the parking that's been approved on paper since 2024.
What to actually do about the parking
The structural fix might be years out, so here's what still works right now if you're headed to this corridor on a weekend night:
- The five-level parking structure behind H-Mart is free and accessible from either the McGaw entrance or directly off Alton Parkway. It's the first place to check, especially on weekend evenings when the front lot is already gone.
- Surface parking out front goes fast but turns over quickly since most of those spots are near the to-go counters.
- The center offers Sunday valet service, which is worth using if you're headed to a sit-down dinner rather than a quick pickup.
- Nearby church parking is available except during Sunday morning services, a workaround plenty of regulars already use but one that disappears exactly when you'd expect the lot to be tightest.
- If you're headed to Mikiya specifically, remember it's a separate lot on Alton Pkwy in Westpark, not the H-Mart structure. Don't circle DJ's garage looking for a restaurant that isn't inside it.
The takeaway for anyone who actually lives near here
The mistake is treating Diamond Jamboree as a fixed destination with a stable roster. It behaves more like a live experiment in Orange County's appetite for AYCE wagyu, running two competing pricing models from the same company a few minutes apart on the same road, while the physical expansion that's supposed to ease the crowding sits in a city planning queue with no announced finish line. The restaurants will keep turning over faster than the buildings do. If you want to eat well here in 2026, follow the corridor, not the parking lot, and don't wait on construction news to plan your Friday night.
This is the kind of on-the-ground detail that doesn't show up in a listing description or a walk score, but it's exactly the texture that makes one Irvine block feel different from another once you actually live here. If you're weighing a move to this part of town, or just curious what your current home near Alton Parkway is worth with this much new activity nearby, Molly Mentaberry can help you get your instant home valuation and talk through what's actually changing in the neighborhood around you.
