Purchasing a commercial flat that lacks Building Regularisation Scheme (BRS) approval, especially when the application is stalled due to a stay order, carries significant risks. While the owner has payment proof and property documents, the absence of official BRS approval means the building might not comply with current regulations. It's crucial to understand that BRS approval is mandatory for commercial properties to ensure compliance with building codes and zoning laws. Proceeding without this approval could lead to future legal complications or even demolition orders.