using System;

using System.Collections.Generic;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        var fac = new Facility{

            facId = 45

        };

        Console.WriteLine(JsonConvert.SerializeObject(fac));

        Console.WriteLine("Hello World");

    }

}

public class Facility

{

    public Facility (){

        this.SupplementalInterestObjects = new List<SupplementalInterestObject>();

    }

    public int facId {get;set;}

    [JsonIgnore]

    public List<SupplementalInterestObject> SupplementalInterestObjects {get;set;}

    [JsonProperty("SupplementalInterestObjects")]

    public List<Object> fakeSuppInterestObjects {

        get{

            if (this.SupplementalInterestObjects != null && this.SupplementalInterestObjects.Count > 0)

            {

                return new List<Object>(this.SupplementalInterestObjects);

            }

            return new List<Object>{new object {}};

        }

    }

}

​

public class SupplementalInterestObject {

    public string blah {get;set;}

    public string otherthing {get;set;}

}