The brokerage behind the team
David Pham and Kevin Castillo are affiliated with Weichert, REALTORS® – Rainbow Properties, an independently owned office in Newark, California.

Visit or contact the office
6658 Thornton AvenueNewark, CA 94560
510-944-1454
Official office website
Broker/Owner: Adam Modzeleski, CA DRE #01918384.

Serving the Bay Area from Newark since 1983
The brokerage says it has operated from the same Newark location since 1983. Today, Rainbow Properties is a locally operated Weichert affiliate led by broker/owner Adam Modzeleski.
Its own description brings real estate and lending services together under one roof. The office serves buyers and sellers across Bay Area communities, while this site offers general homeownership lessons for anyone who wants to learn.
Read more on the brokerage's About page and the official office site.
In the community
In spring 2026 the team ran a neighborhood food drive in Ardenwood, Fremont. Read the story and see the photos.
2019 Best of Newark recognition
Weichert's September 2019 announcement reports that the office won the Argus Readers' Choice "Best Real Estate Office" award and that Adam Modzeleski was recognized in two individual categories. This is a historical announcement. Read the Weichert announcement.
Affiliation and disclosures
Each Weichert® franchised office is independently owned and operated. Equal Housing Opportunity.
Check current license status through the California DRE license lookup. Educational content on this site is separate from a professional engagement and is not individualized advice.