"One of the unique things about CDB is they have the ability to invest in very large infrastructure projects. Also they have a very long-term focus."
Last week, Prime Minister John Key poured cold water on Auckland Mayor Len Brown's plans for the rail loop, saying it was not going to happen anytime soon and that he was not convinced of the project's merits.
Yesterday's agreement will allow co-operation with the bank on big development projects in Canterbury, as well as in agriculture, infrastructure, natural resources and finance. The deal was witnessed by Chinese Deputy Premier Hui Liangyu and Finance Minister Bill English.
Mr English said he didn't expect the bank to play a big role in the reconstruction of Christchurch but suggested hotels and other tourism infrastructure were likely investments.
"The most significant overseas assets damaged by the earthquakes were actually the hotels and we've got growing tourism with Asian countries and so it's logical that Asian investors who currently do own the hotels would be looking at whether they're going to invest to replace them."
A spokesman for Mayor Brown said a number of foreign investors had shown interest in Auckland's infrastructure projects and some had met the council.
"Auckland Council and Auckland Transport are currently assessing the best options for both the construction and the financing for these transportation projects," the spokesman said.
In November, Mr Brown will travel to China and will be looking at some of the more advanced tunnelling technologies the country uses.
"We really want to get on with this project," the spokesman said, "and we're at the stage now where we're considering what the best options are."