MILAN, May 22 (Reuters) - The family office of Japanese

billionaire Tadashi Yanai, founder and chief executive of Uniqlo

operator Fast Retailing ( FRCOF ) , has agreed to buy a building

in Milan for about 300 million euros ($339 million), a source

close to the matter said on Thursday.

Yanai, Japan's richest man, is buying the building from U.S.

property firm Hines, the source added. Hines declined to

comment. Yanai could not immediately be reached for comment.

Hines bought the building in 2016 and renovated it. Located

near Milan's main Duomo square, the building stands across from

the city's Starbucks Reserve Roastery in the elegant Piazza

Cordusio.

Ynai was advised by JLL. The real estate and investment

management services firm confirmed it worked as an adviser for a

family office involved in the transaction, without giving

further details.

The sale was first reported by Green Street News, which said

that Yanai had recently bought also a Uniqlo-occupied building

in Amsterdam and another one in London.

($1 = 0.8855 euros)

(Reporting by Elisa Anzolin; Editing by Valentina Za)