As more businesses opt for a legal status known as "real estate investment trusts" (REITS) to qualify for tax breaks, they have an active champion in Washington, the trade group known as the National Association of Real Estate Investment Trusts.

The group may not have the name recognition of some of the larger financial lobbies, such as the American Bankers Association or the Real Estate Roundtable, but it has a very active lobbying profile, primarily on tax bills. This week the group, known as NAREIT, reported spending more than $1 million during the first quarter of this year, almost doubling ...