Ottawa's Lansdowne 2.0 redevelopment faces risks including a tight construction timeline, tariffs, Redblacks attendance and the uncertainty around signing a deal until 2025, according to the city's auditor general office.

In a report released Monday, the office takes another look at the $419 million development of the housing, retail and sports hub along the Rideau Canal in the Glebe.

It raises concerns that the city's 10 per cent contingency fund may not cover extra costs, leaving taxpayers to pay for more of the project.

The way the city is relying on Ottawa Redblacks revenue growth could also leave it short, it said, while delays with tight timelines to finish the new arena and northside stands and towers could cost it penalties in its deal for the towers.

In the short term, there

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