In fact, the US National Security Agency (NSA) and the British intelligence agencies (GCHQ) have had their share of surveillance on the AU building, according to documents which were extracted by Le Monde, in collaboration with The Intercept.

The Bugged Embassy Case: What Went Wrong

By ELAINE SCIOLINO, Special to the New York Times
Published: November 15, 1988

WASHINGTON, Nov. 14— In 1969, after years of tortuous negotiation, the Nixon Administration signed an agreement with the Soviet Union providing for new embassy complexes in Washington and Moscow.

The American project was to be the most elaborate and expensive United States embassy ever, a testament to American wealth and power.

Today, the eight-story American chancery in Moscow stands useless, infested with spying systems planted by Soviet construction workers, a stark monument to one of the most embarrassing failures of American diplomacy and intelligence in decades.

Over the years, the United States has spent $23 million on the building, but more than twice that amount in an attempt to figure out how the Soviets used eavesdropping devices to transform it into a giant antenna capable of transmitting written and verbal communications to the outside.

http://www.nytimes.com/1988/11/15/world/the-bugged-embassy-case-what-went-wrong.html

U.S. Finally Opens Moscow Embassy / Building was delayed 15 years after Russians riddled it with bugs

Kathy Lally, Baltimore Sun Published 4:00 am, Saturday, July 8, 2000

2000-07-08 04:00:00 PDT Moscow -- The first time around, the new American Embassy building in Moscow was like a giant Soviet antenna, a monument to the ingenuity of the KGB and a constant and embarrassing reminder to the United States of a skirmish lost in the hard-fought Cold War.

On Thursday, however, U.S. Ambassador James Collins welcomed reporters to the second version of the building, finally open and operating 15 years after the first attempt had to be abandoned when it was discovered that the construction materials were loaded with Soviet listening devices.

"It's a symbol," Collins said. "We are entering a new era in our relations with the Russian Federation. It's permanent and very long-term. This building reflects a lot of what we're trying to do today."

Best of all, the embassy is supposed to be bug-free, though the ambassador put it far more diplomatically.

http://www.sfgate.com/news/article/U-S-Finally-Opens-Moscow-Embassy-Building-was-2714015.php