Los Angeles (CNN) Authorities say a man arrested for assaulting a real estate agent during an open house in California has attacked at least four other women this year.

Alen Karaboghosian, 45, was charged with assault with intent to commit rape and four counts of sexual battery, the Los Angeles County District Attorney's Office said Friday.

He pleaded not guilty during his arraignment Friday and is being held on a $180,000 bail, a district attorney's office spokesman said.

The Los Angeles-area man was arrested days after a 51-year-old woman reported being attacked and groped by a man during an open house in Encino, California.

Karaboghosian has been accused of assaulting four other women, including another real estate agent, in multiple incidents since February, the district attorney's office said.

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