Data center builder CyrusOne has got US$600 million funding, made up of a $450m unsecured credit facility and a $150m unsecured loan.

CyrusOne is expanding fast, in a race against rivals including Digital Realty and Dupont Fabros, and this new credit facility doubles the $225m it could previously access. It also has a lower interest rate (LIBOR + 1.7 percent).

“In moving to an unsecured structure, while significantly increasing the aggregate commitment, we have enhanced financial flexibility and the capacity to fund our growth at attractive interest rates,” said Kimberly Sheehy, CyrusOne’s chief financial officer,

The financial world is paying attention to the data center builder, with analysts at ING Group, Stifel Nicolaus and Citigroup now covering its stock. In ratings before the new funding announcement, the consensus was “buy”, according to investment site WKRB.

Not everyone is so positive, with some pointing out a threat from large-scale cloud providers like Google and Amazon.