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  • The Santa Clara County Board of Supervisors received a report...

    (Jose Carlos Fajardo/Bay Area News Group)

    The Santa Clara County Board of Supervisors received a report on marijuana cultivation at its April 3 meeting, but didn't seem in any hurry to lift its moratorium on pot sales. (Jose Carlos Fajardo/Bay Area News Group)

  • JP Noda stocks cannabis at The Apothecarium shortly before the...

    Noah Berger/Associated Press

    JP Noda stocks cannabis at The Apothecarium shortly before the store opened for its first day of recreational marijuana sales on Saturday, Jan. 6, 2018, in San Francisco. The announcement that the U.S. Department of Justice would no longer adopt a "hands-off" approach to states that have legalized marijuana use initially sent some in the industry into a tailspin, just days after the $7 billion California recreational weed market opened for business. (AP Photo/Noah Berger)

  • The first day of recreational sales for the Big Sur...

    The first day of recreational sales for the Big Sur Canna Botanicals store in the Carmel Rancho Center in Carmel on Friday, Jan. 5, 2018. (Vern Fisher - Monterey Herald)

  • Cannabis consultant Lisa Davis helps customer Rudy Bucher during the...

    Cannabis consultant Lisa Davis helps customer Rudy Bucher during the first day of recreational sales for the Big Sur Canna Botanicals store in the Carmel Rancho Center in Carmel on Friday, Jan. 5, 2018. (Vern Fisher - Monterey Herald)

  • Mike Bacon, cannabis consultant at the Big Sur Canna Botaniclas...

    Mike Bacon, cannabis consultant at the Big Sur Canna Botaniclas holds a sample of marijuana on the first day of recreational sales for the Big Sur Canna Botanicals store in the Carmel Rancho Center in Carmel on Friday, Jan. 5, 2018. (Vern Fisher - Monterey Herald)

  • Customers line up at the counter to purchase marijuana at...

    Customers line up at the counter to purchase marijuana at Harborside in Oakland, Calif., on Monday, Jan. 1, 2018. Residents of California can now legally purchase recreational marijuana. The store opened their doors at 6 a.m. to a crowd of over 250 people. (Jose Carlos Fajardo/Bay Area News Group)

  • WEST HOLLYWOOD, CA - JANUARY 02: A customer smells a...

    WEST HOLLYWOOD, CA - JANUARY 02: A customer smells a cannabis product at MedMen, one of the two Los Angeles area pot shops that began selling marijuana for recreational use under the new California marijuana law today, on January 2, 2018 in West Hollywood, California. Los Angeles and other nearby cities outside of West Hollywood have not finalized their local permitting rules so licenses to businesses in those jurisdictions are yet to be granted. (Photo by David McNew/Getty Images)

  • FILE - In this April 15, 2017, file photo marijuana...

    Richard Vogel/Associated Press

    FILE - In this April 15, 2017, file photo marijuana plants are displayed for sale at the ShowGrow dispensary, a medical marijuana provider downtown Los Angeles. California on Monday, Jan. 1, 2018, becomes the nation's largest state to offer legal recreational marijuana sales. In general, the state will treat cannabis like alcohol, allowing people 21 and older to possess up to an ounce of pot and grow six marijuana plants at home. Voters approved legalization in 2016. (AP Photo/Richard Vogel, File)

  • Harborside employee Michele Chee labels marijuana buds in a display...

    Harborside employee Michele Chee labels marijuana buds in a display case at Harborside in Oakland, Calif., on Monday, Jan. 1, 2018. Residents of California can now legally purchase recreational marijuana. (Jose Carlos Fajardo/Bay Area News Group)

  • Marijuana buds are shown in a display case at Harborside...

    (Jose Carlos Fajardo/Bay Area News Group)

    Marijuana buds are shown in a display case at Harborside in Oakland, Calif., on Monday, Jan. 1, 2018. Residents of California can now legally purchase recreational marijuana. (Jose Carlos Fajardo/Bay Area News Group)

  • Marijuana are displayed on a rack at Harborside in Oakland,...

    (Jose Carlos Fajardo/Bay Area News Group)

    Marijuana are displayed on a rack at Harborside in Oakland, Calif., on Monday, Jan. 1, 2018. Residents of California can now legally purchase recreational marijuana. (Jose Carlos Fajardo/Bay Area News Group)

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Marisa Kendall, business reporter, San Jose Mercury News, for her Wordpress profile. (Michael Malone/Bay Area News Group)
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As recreational marijuana sales ramp up throughout the Bay Area, could the newly legal drug end up creating an unexpected type of high — in our real estate market?

Researchers looking at the impact of legalized recreational marijuana on Denver’s home prices found a surprising trend: dispensaries that began selling recreational marijuana had a “large positive impact on neighboring property values.”

After recreational sales became legal, houses close to a participating dispensary saw their value increase more than 8 percent relative to homes located slightly farther away, the study found. It’s a small study based on data from only one metro area, but the research — the first of its kind — could provide an important glimpse into the potential impact of legalization.

“We went into the project and we weren’t really sure what to expect,” said James Conklin, a real estate professor at the University of Georgia who co-authored the paper called “Contact High: The External Effects of Retail Marijuana Establishments on House Prices” last summer. “We thought maybe there would be a negative impact. I think our takeaway after working on the project was that we don’t see a negative effect — we do see results point to a positive effect.”

Conklin and his co-authors found that after recreational marijuana sales became legal in Denver at the beginning of 2014, single-family homes located near dispensaries saw their values go up. Homes within 0.1 miles of a dispensary saw gains of 8.4 percent relative to houses located between 0.1 and 0.25 miles away.

These weren’t new dispensaries — they were existing medical marijuana dispensaries that expanded to recreational sales when it became legal.

That study isn’t the first to indicate a correlation between rising home prices and the legalization of recreational marijuana, but its authors say it’s the first to do so at a highly localized level. A similar report written by two University of Mississippi professors and real estate information company FNC found legalization leads to an average 6 percent increase in housing values in Colorado. That paper, called “The Effect of Legalizing Retail Marijuana on Housing Values: Evidence from Colorado,” compared property gains in municipalities that adopted recreational use to those that didn’t.

And realtor.com found that since the first recreational pot shops opened in Colorado on Jan. 1, 2014, the median home price in the state jumped from $248,000 in the first half of 2014 to $298,000 in the first half of 2016. That’s partially attributable to the state’s population increasing almost 2 percent during that time period, the researchers say, but they also claim more home buyers are relocating there from out-of-state because of the law change.

Conklin and his co-authors did not claim to know why recreational marijuana might increase home values, but they theorized it could be because legalization led to a surge in housing demand prompted by marijuana-related jobs, lower crime rates or the clustering of other amenities near dispensaries. They cautioned that other cities might not experience the same impact.

Rick Smith, president of the Santa Clara County Association of Realtors, said he was “flabbergasted” by the Colorado study. Dispensaries are prohibited from being too close to neighborhood schools, he said, adding: “Typically things that have those types of restrictions do not advance home values.”

Oakland-based realtor Kerri Naslund-Monday said she’s seen commercial property values rise in Oakland, where marijuana growers are snapping up spaces. But she doesn’t expect residential home values to catch that buzz.

“The demand here is so high already,” she said, “even without that element, that I don’t foresee it causing too much of an effect that could be measured.”