Kenney & Kearney, a Cherry Hill, N.J., litigation boutique, is deconstructing after 20 years, following other small- to midsize firms that, unable to meet corporate clients’ demands, are seeking merger partners, falling prey to raiders or simply falling apart.

In Kenney & Kearney’s case, opportunity knocked. Benjamin Levin, head of the Voorhees office of Philadelphia’s 250-lawyer Ballard, Spahr, Andrews & Ingersoll, came calling last May, wanting to build a New Jersey litigation practice to go along with existing groups in real estate, environmental and employment law.