US wholesale data center developer and landlord DuPont Fabros Technology (DFT) has slightly tightened its full-year 2012 earnings guidance range, raising its bottom end by US$0.01 and lowering the top by $0.02. The new funds-from-operation guidance, announced Wednesday, is $1.48 to $1.52.

The company raised the low end of its guidance, assuming it will not commence any new leases before the end of the year. Year to date, DFT has signed a total of about 28MW of data center capacity and 140,000 sq ft of raised floor.

These were nine leases, together representing higher capacity than 13 leases it had commenced as of this time last year (about 24MW).

DFT reported $85.4m in revenue for the third quarter, up 16% year over year. The quarter’s earnings were $0.11 per share, down from $0.22 per share year over year.

In the third quarter, DFT signed two leases totaling about 3.5MW and 18,000 sq ft of raised floor. One of them (2.17MW) was at its ACC6 data center in Ashburn, Virginia, and the other in Chicago (1.3MW).

ACC6 is the company’s latest build. The deal closed at this site in the third quarter has put occupancy rate of this site’s first phase at 100%.

Hossein Fateh, the company’s president and CEO, said, “We continue to remain focused on leasing up our available inventory in all of our markets, with ACC6 Phase I in Ashburn, Virginia now 100% leased.”

Another big success for the quarter was extending maturity dates for leases to three tenants. The expansion includes all space at DFT’s ACC3 data center in Ashburn, which is now under contract to be occupied until 2024-2026.

“As of today, leases that represent less than 15% of our annualized base rent are scheduled to expire prior to January 2017,” Fateh said.

About 85% of space across all of the company’s operating data centers is leased. It is currently building Phase II of ACC6, which is already 67% pre-leased.