Richard, you're posting a question in the Q&A section of this website, and are not contacting the listing agent directly. Plus, there is no property referenced in your question.
If you are serious about buying a home then you absolutely need to find a REALTOR to work for you as a Buyer's Agent. He/she will be able to research the property, determine fair market value, and put together a written offer. Verbal offers on a public website are not the way to go.