Boston Properties Inc. (BXP) agreed to sell a 45% interest in three buildings in New York City and Boston to affiliates of Norway's sovereign-wealth fund for $1.5 billion.

The deal with Norges Bank Investment Management involves stakes in 601 Lexington Avenue in New York City, as well as the Atlantic Wharf Office Building and 100 Federal Street in Boston. Each building is at least 91% leased.

The agreement is another example of foreign investors getting involved in U.S. commercial real estate. Increased demand from overseas has helped drive U.S. commercial property values to high levels, particularly in major cities favored by global firms.

Foreign buyers are seeking out the U.S. as a place to spend their growing piles of cash, particularly as other markets such as Europe remain weak. Non-U.S. buyers purchased more than $46 billion of property in 2013, up from $35 billion in 2012 and the most since 2007, according to real-estate data firm Real Capital Analytics Inc.

Last year, Boston Properties sold a 45% stake in the office tower at 7 Times Square for $684 million to the Norwegian Government Pension Fund Global. Boston Properties reported a $386 million profit on the sale.

In the latest deal, Boston Properties said it plans to distribute at least the amount of proceeds necessary to avoid paying a corporate-level tax on the gain realized from the sale.

Boston Properties and affiliates of NBIM will form a joint venture for each property upon closing, and Boston Properties will retain property and leasing management for the ventures.

The Norwegian oil fund is the world's biggest sovereign-wealth fund, and it was set up in the 1990s to act as the main investment vehicle for Norway's vast oil wealth. It has expanded more than tenfold in the past decade and is expected to be worth 7.278 trillion Norwegian kroner ($1.18 trillion) by 2020. It's managed by NBIM, an arm of Norway's central bank.

To reach its ambitious real-estate growth targets, NBIM plans to invest more than 1% of the fund's value in real estate each year through 2016, equal to more than NOK50 billion. The fund's target is that 5% of its cash should be held as real estate.

However, after three years of real-estate purchases, the fund's real-estate portfolio is still stuck at only 1.2% of the total fund value at the end of the second quarter, unchanged from the previous quarter.

To boost that share, the fund had appointed a separate leader group for real estate and announced plans to increase its staff to 600 from currently 398, mainly to handle the real-estate growth.

NBIM holds stakes in office properties in the U.K., France, the U.S., Germany and Switzerland, mainly through partnerships.

--Eliot Brown and Kjetil Malkenes Hovland contributed to this article.

Write to George Stahl at george.stahl@wsj.com

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