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A Clear Channel Outdoor billboard advertising a Mercedes-Benz smart car is seen in Ipswich, England, in April 2015. Geography Photos/UIG via Getty Images

By Liana B. Baker

(Reuters) -- Billboard operator Clear Channel Outdoor is exploring the sale of assets in some U.S. markets that could be worth at least $800 million, according to sources familiar with the matter.

Clear Channel Outdoor has hired boutique investment bank Moelis & Co to advise on the potential sale, the sources said on Tuesday. They asked not to be named because the matter is private.

Clear Channel Outdoor did not return a request for comment. A spokesman from Moelis declined to comment.

Clear Channel may be looking to divest its holdings in cities such as Las Vegas, Seattle, Portland, and Bentonville and Fort Smith, Arkansas, one of the people said, adding that the regions where assets may be sold could change.

Potential buyers include Outfront Media, Lamar Advertising REIT Co, GTCR LLC, which bought Fairway Outdoor Advertising last year, and France's JCDecaux SA.

Clear Channel wants to sell the assets to help pay off some of the $20.6 billion in debt held by its parent company, iHeartMedia, which was taken private in 2008 by buyout firms Bain Capital LLC and Thomas H. Lee Partners for $19 billion, the people said.

Clear Channel generates revenue from brands that rent out space on its digital and static billboards, which can be found on highways, buildings and other outdoor spaces.

The assets Clear Channel is looking at selling generate estimated annual earnings before interest, taxes, depreciation and amortization of $60 million to $70 million.

Billboards are holding their own with local audiences and advertisers even as attention slips for other sorts of regional advertising, such local newspapers facing circulation declines or TV commercials that viewers increasingly are able to skip.

Reuters reported last year that Clear Channel Outdoor tried to sell its European assets in a deal potentially worth more than $2.5 billion, but then put the process on hold due to the weakened euro.

About 88 percent of Clear Channel Outdoor is owned by iHeartMedia. The rest of Clear Channel Outdoor is publicly traded with a market capitalization of about $2.18 billion. Its shares have tumbled more than 45 percent this year due to lost market share to competitors and concerns about its parent company's performance, analysts said.

(Reporting by Liana B. Baker; Editing by Leslie Adler)