Samples of requests for approval. Use the following samples to guide you when writing a request for approval letter.These forms are now available at the Department of City Planning's Forms page. All building permit applications are referred to the City Engineer for checking of property descriptions and assignment or approval of street address numbers. Preapproval letters state how much a lender is willing loan to a borrower. In this article, you'll find everything about different types of requests for approval and easy ways to successfully submit them. You must have a site plan and an approval letter from your contract city.