Within the National Capital Commission's corporate plans, it identifies the overall expenditures it will be undertaking based on its entire budget. It breaks that budget down based on large categories, including upkeep and maintenance of things like the entire suite of official residences. This specific issue was not identified as a separate line item, so I don't know the initial budget. As part of its planning, it would have had budgets and budget projections.
On October 31st, 2023. See this statement in context.