When you say “after the agreement is signed,” do you mean the service engagement or the sale agreement? That changes the risk considerably. Also, are you the buyer or owner? A buyer may need findings before an offer becomes firm, while an owner commissioning improvements can work to a less...
What falls under “included charges”? It would help to separate fixed property-related charges from electricity, water, internet and any other usage billed to the tenant. If utilities are shared or remain in someone else’s name, explain how the amounts are calculated.