Digital Realty Trust Inc. has agreed to buy Telx from private-equity firms ABRY Partners and Berkshire Partners in a deal valued at $1.89 billion, the latest sign of consolidation in the data-center space.

Telx managed 1.3 million square feet of data center space as of March 31 and leases more than half of its 20 facilities from Digital Realty. Digital Realty said the deal will double its footprint in the co-location business.

Co-location operators rent space by rack, cage or room. The business has grown as companies increasingly outsource data management and information-technology handling.

The deal is expected to close later in the year.

The acquisition comes amid rising demand for data centers—vast warehouses of computer and telecom equipment that power the Internet—as consumers use more data on their mobile phones and so-called cloud services, a catchall term for files accessed remotely over the Internet but hosted on outside computers.

Earlier this year, U.K.-based Telecity Group PLC agreed to merge with U.S.-listed peer Interxion Holding NV to form a data-center operator with a combined value of $4.5 billion as the industry in Europe scrambles to meet ballooning demand for digital services.

Write to Chelsey Dulaney at Chelsey.Dulaney@wsj.com

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