The City of Edmonton and the Edmonton Arena Corporation (EAC) are suing the architects of Rogers Place.

EAC is owned by the Katz Group and is also the company that owns the Edmonton Oilers.

The statement of claim was filed by the city and EAC on May 6.

The two parties are seeking $4.8 million from 360 Architects Canada Inc, the original architects of the project, and HOK Architects Corporation, the architects who took over the project.

A statement to CBC released by the city and EAC did not specify details of what led to the lawsuit. But it states that a lawsuit "was necessary to proceed with legal action on that date to protect the City and EAC's legal interests."

However, the parties suggest that something like this is not out of the ordinary.

"Within the context of a project in excess of $600 million, a claim in the amount of $4.8 million is in no way unusual," it read. "As part of managing this project, the project team exercised the additional diligence of placing project insurance to cover this very kind of claim."

Construction on the project began in March of 2014.

The arena, combined with the four other components of the project — the community rink, LRT connection, pedestrian pedway and Winter Garden — has an estimated price tag of $606.5 million.

The EAC and the city still anticipate Rogers Place to open in the fall.