A cosigner doesn’t necessarily have to be a parent, and we only require one person to cosign for each tenant. Once you complete the form, please click here to have it notarized. The cost for this online notary service is $25, but it is often the quickest way to verify your identity. You are welcome to print the cosigner form, have it notarized at your local post office, and fax/scan/email it to Hinsdale Properties if you prefer.