San Leandro and Castro Valley 2026: Two Underrated Alameda County Markets

San Leandro and Castro Valley are the East Bay's quietly consistent markets. They generate fewer headlines than Oakland or the Tri-Valley, yet both sit on major transit and commute routes, offer real suburban inventory, and hold their own when prices wobble elsewhere. If your search has not included them, it should.

How much do homes cost in San Leandro and Castro Valley in 2026?

San Leandro's median sale price ran near $870,000 over the three months ending in August 2026, with the average up about 6.5% year over year, while other trackers put the mid-2026 median closer to $842,000. Castro Valley is a step up the price ladder: the average home price is around $1.12 million, up about 8.7% year over year, with a June 2026 median of roughly $1,167,500 and single-family homes selling at a median near $1.25 million. Both markets sit well below Tri-Valley medians in Pleasanton and San Ramon while staying connected to jobs on BART and I-880 and I-580.

What is being built in San Leandro?

The flagship project is the Shoreline Development Project at Monarch Bay, a city-proposed plan along roughly 75 acres of public shoreline with about 500 housing units, restaurants, retail, a new Mulford-Marina Library, and improvements to the marina golf course and parks. It remains in the proposal and entitlement stage as of the city's July 2026 update, so it is a long-term story worth watching rather than a near-term supply wave. In the meantime, new retail has arrived along the city's corridors: Sprouts, Philz, and Centro Callan all opened in 2025.

What is changing in Castro Valley?

Castro Valley is unincorporated, so projects run through Alameda County rather than a city. The Castro Village Shopping Center redevelopment is underway, with a new retail building in Phase 1 projected to finish around spring 2027, followed by improvements to the Castro Village Bowl facade. Valley View Park is getting roughly $6.3 million in master-plan upgrades, with construction from summer 2026 into spring 2027. On the for-sale side, new construction is arriving from about $1.09 million at The Chapter community, alongside other builder homes across the hills.

Which market fits you better?

First-time buyers and commuters leaning on BART and I-880 tend to land in San Leandro, where condos and townhomes offer entry points well under the citywide median, and San Leandro Unified serves the city's schools. Buyers who want hillside character, more land, and a quieter suburban feel, and who can reach the $1.1 million-plus tier, gravitate to Castro Valley, served by Castro Valley Unified. Both reward a patient buyer who understands that value here is steady, not flashy. For a wider view of how these two compare to the rest of the region, see my East Bay and North Bay Buyer Comparison Guide and the Neighborhoods page.