The council agency which runs many Auckland facilities is worried about the impact that an America's Cup village will have on the Maritime Museum.
Regional Facilities Auckland has given its backing in principle to the revised Cup plans, but could withdraw that once the full impact of the development is known.
The agency's views are flagged in a letter lodged with a resource consent application for the plan agreed last month to build seven bases for the 2021 regatta.
One of the main bases will be built on a 74-metre extension of Hobson Wharf, adjacent to the Maritime Museum.
RFA's chief executive Chris Brooks says the effect of that work, both on the museum, and on historic boats that it moors at the wharf, is not yet clear.
Elsewhere in the application material, the council identifies the Hobson Wharf extension as one of the main lasting infrastructure levies from the $212 million development.
Up to five bases may be built on former bulk fuel storage sites on Wynyard Wharf, and a consultants report says there's a good understanding of the contamination that may be found.