DETROIT (WWJ/AP) – The Detroit Symphony Orchestra says four foundations are giving a combined $18.5 million to the organization to boost programming and its permanent endowment.

The ensemble said Monday the lion’s share — $15 million — comes from the William Davidson Foundation. The contribution from the longtime benefactor continues its sponsorship of the orchestra’s Neighborhood Concert Series.

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The Davidson Foundation gift includes a $5 million challenge grant to encourage additional support for the endowment. The orchestra says that challenge is halfway met with contributions from The Andrew W. Mellon Foundation, Fred A. and Barbara M. Erb Family Foundation and Dresner Foundation.

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“The Detroit Symphony Orchestra has recently achieved tremendous successes, with five consecutive balanced budgets, increased individual giving, and our highest ticket sales in years,” Mark Davidoff, Chairman of the DSO Board of Directors, said in a statement. “While there is more to be done as we move into the second half of our ten-year plan, we want to take the time to thank all those who have believed in and supported our vision to increase and broaden the DSO’s impact in our resurgent city and region.”

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© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.