Global tech giant Microsoft has released new plans for a mega data centre on the lower north shore.

The Lane Cove Technology and Media Park on Mowbray Road is set to be redeveloped into a 4-storey data centre facility as part of a project designed to meet demand for the safe storage of information in the cloud.

With a project value of about $350m, the development will include 12 data halls along with electrical substations, loading docks, 13 emergency generators, on-site fuel storage tanks and 42 parking spaces.

The latest plans show the proposal has been scaled back from 6-storeys and 14 data halls.

Residents are still raising concerns over the impacts of the project, including noise, excavation works, spoil removal, the storage and use of diesel fuel at site, the handling of hazardous materials, loss of trees and dust.

Microsoft is the latest company to join the data race on the north shore, with construction works nearing completion of a $238m data centre by NextDC on the corner of Broadcast Way and the Pacific Highway in Artarmon.