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The number of independent living units provided by the nation’s 10 largest not-for-profit providers has more than doubled during the last 10 years, according to a new report released last week.

On average the systems in report have between 699 and to 21,251 units, and at least half of the systems offer government subsidies. Also, new community development is the most popular form of expansion among the nation’s 10 largest senior living systems, according to the second annual report by the American Association of Homes and Services for the Aging (AAHSA) and Ziegler Capital Markets Group.

The so-called AAHSA Ziegler 100 (AZ 100) also states that expansion of organizations through acquisitions and mergers is up dramatically in the last 10 years. The 125-page report is available at www.aahsa.org and at www.zieglerseniorlivingfinance.com.