SAN JOSE — A small commercial building at a high-profile spot on the edge of downtown San Jose has flopped into a loan default, a grim reminder of the widespread nature of the Bay Area real estate downturn.

The building whose loan is in default is at 478 East Santa Clara Street next to South 11th Street, according to documents on file at the Santa Clara County Recorder’s Office.

The loan delinquency is just one of a growing number of problems that have beset the Bay Area’s commercial property markets.

A wide range of problems have jolted the office, retail and hotel sectors in downtown San Jose, downtown Oakland, and San Francisco.

Empty office spaces, slumping rents, sky-high office vacancies, and a meltdown in real estate values have coalesced into a worsening commercial property m

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