If your OC wants to raise a special levy then there is a requirement under Section 76 of the Strata Schemes Management Act that a General Meeting be held to approve raising of the levy. It’s not something the Executive Committee or Strata Manager can do off their own bat. You’d expect that in the notice of meeting you would receive complementary information on why the work was considered necessary and copies of quotes for the work. With that amount of money you’d expect also that a qualified building consultant would be giving a specification for the works to ensure that they meet current requirements.