Prometheus Real Estate Group has scooped up the 173-unit Highlander apartment complex at 620 Iris Avenue in Sunnyvale for about $69.5 million, deepening the San Mateo-based investor’s stake in a Bay Area rental market that is tightening as AI-era hiring strains local housing supply. The deal pencils out to roughly $402,000 per unit.
According to Silicon Valley Business Journal, Prometheus bought the Highlander from a joint venture of Northwest Investments and Central Investments. The outlet groups the sale with a cluster of recent South Bay multifamily trades as investors chase scarce inventory in one of the region’s hottest submarkets.
Market Pressure Behind The Deal
The Real Deal, citing CoStar data, reports that average rents in Santa Clara County hover near $3,400 a month and could climb to roughly $3,600 over the next two years. At the same time, apartment construction starts in the region remain well below pre-pandemic levels. That mix of rising rents and limited new supply helps explain why buyers are willing to pay premiums for stabilized assets in Sunnyvale’s core.
Offices Becoming Housing In Sunnyvale
Developers are also working to turn underused office properties into badly needed housing. Silicon Valley Business Journal reports that the city signed off on a plan to demolish a one-story office building at 215 Bordeaux Drive and replace it with about 265 residential units. The project is part of a broader push to reshape parts of Moffett Park into mixed-use neighborhoods. Those approvals help on paper, but analysts quoted in the coverage say such projects will not quickly erase today’s shortage of apartment stock.
What Prometheus Bought
Industry records show the Highlander at 620 Iris Avenue includes 173 units across roughly 149,449 square feet, according to Yardi Matrix. Prometheus lists the same address and highlights the community’s walkable access to downtown Sunnyvale and nearby tech employers, a combination that helps support strong leasing demand in the submarket.
Why Investors Are Back
Other recent deals underscore how competitive the hunt for apartments has become. Ethos bought the 148-unit Crossings at 1180 Lochvinar Avenue for about $67.7 million, and PGIM and Interstate Equities paid roughly $76.9 million for the 184-unit Maddox on East El Camino Real, according to The Real Deal. With new construction still muted, these stabilized properties offer relatively predictable cash flow and a foothold for firms betting on continued tech hiring and rent growth.
For Sunnyvale renters, the near-term outlook points to tighter inventory and further upward pressure on monthly payments. For buyers, deals like the Highlander are a calculated wager that the region’s AI-era rebound will keep demand strong. Expect more acquisition activity and targeted development proposals as capital chases the limited supply of well-located multifamily assets.
