Riviosa construction team · Southern California
Four independently licensed California contractors — general contracting, foundations and shoring, structural steel and framing — working together now on The Crown, 4501 Via Corona, Torrance.
For property owners and developers
Foundations, structural steel and framing are where a slow handoff costs the most. On The Crown, each of these trades is held by its own licensed company, under one general contractor, working to one project schedule.
If you are planning a build in Southern California and want a team that has already shared a job site, start with Vince Ngo at Riviosa. He will tell you plainly whether the team fits your project.
Each company contracts for its own scope. "Riviosa Construction Team" describes the project team coordinated by Riviosa; it is not a joint venture or a single licensed entity. Verified license records are listed below.
The team
The four license numbers shown below were checked with CSLB on October 2, 2026. Each corresponding profile links to the official record.
01 / General contractor
Ken Johnson Development Inc.
General contractor of record at The Crown. A South Bay builder of custom homes whose own gallery features homes in Manhattan Beach and Rolling Hills.
View profile02 / Foundations & shoring
Alexander Construction and Engineering
Caisson drilling, foundation and shoring work at The Crown, documented by Riviosa's progress photographs and the company's invoices.
View profile03 / Structural steel
Hernandez Steel Inc.
Proposal accepted for The Crown's structural steel: fabrication, erection and welding of beams and columns.
View profile04 / Framing
Crisfield Construction Inc.
Proposal accepted for The Crown's framing labor, scheduled to follow foundation and steel work.
View profile05 / Electrical & smart homes
Electrical and smart-home design and installation.
Land Design Build is Riviosa's designated contractor for electrical and smart-home work, bringing design and installation together as part of the coordinated project team.
Land Design Build developed a custom smart-home system that Vince describes as an alternative to Lutron HomeWorks, at approximately half the cost. This is Vince's preliminary comparison; final pricing and capabilities depend on the project scope and selected equipment.
Discuss electrical & smart-home scopeActive project · Torrance
A hillside residence designed around ocean, downtown and mountain views, a private motor court and generous outdoor space. It is under construction now, so the work described here is current, not a past-portfolio claim.
Riviosa is the developer and manages budget, design, procurement, subcontractor coordination, field decisions and delivery.
The Crown on riviosahomes.com
| Company | Scope | Status |
|---|---|---|
| Ken Johnson Development Inc. | General contractor of record | Active |
| Alexander Construction & Engineering | Caisson drilling, foundations and shoring | Work performed; in progress |
| Hernandez Steel Inc. | Structural steel: fabrication, erection and welding of beams and columns | Proposal accepted, July 2026 |
| Crisfield Construction Inc. | Framing labor | Proposal accepted, August 2026 |
Progress on site · Photographs by Riviosa, 2026
Process
On a hillside lot, the structure is only as good as the sequence. This is the order the team follows at The Crown, and how we would approach yours.
Vince reviews your site, plans and timeline, then introduces the trades that fit. You contract directly with each licensed company.
Drilled caissons, shoring and structural concrete establish the base before anything goes vertical.
Beams and columns are fabricated, set and welded, so framing can tie into the steel.
Framing follows steel, with the general contractor responsible for the overall construction.
Interiors & finish craft
Riviosa brings the same attention to kitchens, closets, fixtures and finished surfaces as it does to the structure.
Drywall & finish work
Riviosa's finish specialist
Vince identifies Ruben as his expert for drywall finishing, with their first contract at 5407 Via del Valle — The Light House — serving as the reference for the working relationship.
For The Crown, the ambition is to build on that experience and achieve an even higher finish standard. This is the target for the upcoming work.
Discuss finish work with VinceKitchens & closets
Recommended showroom · proposals in development
Vince recommends Poggenpohl for the kitchen and whole-home closet scope. The California showroom is developing kitchen, coffee bar and closet options for The Crown, including selected display pieces where they suit the design.
The aim is a cohesive interior with exceptional materials and thoughtful value. Final selections, closet brands, scope and installation remain subject to the project proposal.
Explore PoggenpohlPremium fixtures
Brands under consideration
Riviosa is exploring distinctive kitchen and bath fixtures from Dornbracht and VOLA, with an emphasis on design, craftsmanship and long-term value.
Vince compares project pricing and suitable showroom or display opportunities to make premium products go further within the budget. Savings depend on the selection and availability; each project receives its own quotation.
Explore Dornbracht Explore VOLAVerify for yourself
CSLB recommends checking a contractor's license before you sign, and so do we. Status, bond and workers' compensation details are on each official record.
| License | Business name on record | Classification | Status |
|---|---|---|---|
| 714178 | Ken Johnson Development Inc | B | Current and active |
| 974009 | Alexander Construction and Engineering | A, B, C21, D63 | Current and active |
| 1117807 | Hernandez Steel Inc | C51 | Current and active |
| 1054389 | Crisfield Construction Inc | B | Current and active |
If a record link opens the CSLB search page instead, enter the license number at cslb.ca.gov.