For much of his first year in Washington, President Trump’s EPA Administrator Scott Pruitt occupied prime real estate in a townhouse near the U.S. Capitol that is co-owned by the wife of a top energy lobbyist, property records from 2017 show.

Neither the EPA nor the lobbyist, J. Steven Hart, would say how much Pruitt paid to live at the prime Capitol Hill address, though Hart said he believed it to be the market rate. The price tag on Pruitt’s rental arrangement is one key question when determining if it constitutes an improper gift, ethics experts told ABC News.

“I think it certainly creates a perception problem, especially if Mr. Hart is seeking to influence the agency,” said Bryson Morgan, the former investigative counsel at the U.S. House of Representatives Office of Congressional Ethics. “That’s why there is a gift rule.”