O’Neill submitted a conditional-use application last month for a three-story facility on a vacant, 60-acre property along Front Street. The site, which borders Upper Merion Township and Interstate 476, previously operated as a quarry and cement plant and later as a county solid-waste disposal site, according to the application and county property records.

The property is in West Conshohocken’s heavy industrial zone. The borough adopted an ordinance earlier this year allowing data centers there under conditions that address issues including noise, lighting, landscaping and power generation.

“This is at the early stages of the borough’s land development and conditional use review process,” Borough Manager Doug Borgerson said. He said meetings or hearings will be advertised as required by law.

The West Conshohocken proposal comes as O’Neill pursues two larger projects nearby. In Upper Merion Township, he is seeking to build a data center campus spanning about 4.6 million square feet. Township supervisors unanimously rejected his proposal over the summer, and O’Neill’s legal appeals of that decision remain active, said his attorney, Marc Kaplin.

O’Neill withdrew specific zoning appeals, prompting the cancellation of a zoning hearing board meeting scheduled for this week. That withdrawal did not end the broader appeals of the supervisors’ rejection, Kaplin said.

Across the Schuylkill River, O’Neill is seeking a special exception to build a 2-million-square-foot data center at the closed Cleveland-Cliffs steel mill site on Conshohocken Road in Plymouth Township. The township zoning hearing board held a procedural meeting last week. Montgomery County was granted party status in that proceeding as owner of Ivy Rock Quarry, across the street, allowing county officials to present evidence and question witnesses. The next hearing is scheduled for November; public comment is expected after evidence is presented.

O’Neill has said his proposed facilities would use closed-loop systems that do not require outside water, provide their own power and produce little noise or light. He has also argued the projects would bring jobs and tax revenue. A study he released for the Upper Merion proposal projected more than 10,000 construction jobs, over 700 permanent jobs and $55.4 million in annual local tax revenue.

Neighbors near the Upper Merion and Plymouth sites have opposed the proposals, citing concerns about pollution, noise, lighting, electricity costs, property values and quality of life. O’Neill has not identified who would operate the centers, though he has said they could support artificial-intelligence-powered biotechnology connected to his Discovery Labs life-sciences complex.