The City of Winnipeg says Ottawa owes $6.7 million in unpaid property taxes for the Canadian Museum for Human Rights.

On Friday, finance chair Marty Morantz said the city has a dispute with the federal government over the assessed value of the building.

Morantz said municipal officials believe the value is around $100 million, while Ottawa's estimate is significantly lower at $30 million.

The project cost about $350 million to complete.

Morantz said the city has appealed its case to a federal arm's-length body that deals with tax assessments.