The 330-unit Rock Hill Road apartment project planned by developer O'Neill Properties Group in Bala Cynwyd is up for sale.

Kevin Flynn, president of the Flynn Co., a brokerage and investment firm, said in an interview this month that he was marketing the project at 131 and 151 Rock Hill Rd. on behalf of its current owner, Alexander Street LLC.

King of Prussia-based O'Neill and Alexander Street had been partners on the Rock Hill Road apartments before O’Neill separated itself from the project, Flynn said. 

An O'Neill affiliate purchased the property, a former quarry, for $3.5 million in 2004, according to records filed with the Montgomery County assessor's office. It was acquired by Alexander Street, an affiliate of Sherman Capital Markets LLC of Charleston, S.C., in 2014 for $11.1 million.

The site has been cleared and is ready for a new buyer to begin construction under zoning and plan approvals obtained by O'Neill, Flynn said.

Tracy Fauntleroy, identified on O'Neill's website as the company's press contact, said Friday that he no longer represents the firm and referred questions to founder J. Brian O’Neill. Messages left with Brian O'Neill and Sherman Capital yielded no response.