XML : How to return the inner text representing the Site Address

Im fairly new to XML coding and need some help with a LINQ query that will allow me to return the String the represents the Site Address in the XML response shown in the image below:

XML from Workflow Max API

The XML is the response to an REST GET query for our cloud based job costing system. The code I have so far is shown below:

  string endpoint = "https://api.workflowmax.com/job.api/get/"+ jobnum + "/customfield?apiKey=" + API_Key + "&accountKey=" + Account_Key;  var client = new RestClient(endpoint: endpoint, method: HttpVerb.GET);  var json = client.MakeRequest();  string response = json;      //load the unparsed string into an XML document  XDocument xdoc = new XDocument();  xdoc = XDocument.Parse(response);  string deliveryaddress = xdoc.Descendants("CustomFields").Single().Value;    

How can i get just the text that represents the delivery address?