public class HousingDetailsViewModel : AppViewModel
{
    DataContext db = new DataContext();

    public List<string> units { get; set; }
    public List<AvailableHousing> availableHousings { get; set; }
    public Person person { get; set; }
    public OccupiedHousing currentHousing { get; set; }
    public OccupiedHousing newHousing;

    public HousingDetailsViewModel(int? id)
    {
            units = db.AvailableHousings.OrderBy(ah => ah.Unit).Select(h => h.Unit).Distinct().ToList();
            availableHousings = db.AvailableHousings.Where(h => h.Available == true).OrderBy(h => h.Bed)
                                                                                    .OrderBy(h => h.Room).ToList();
            currentHousing = db.OccupiedHousing.Include(o => o.AvailableHousing)
                                               .Include(o => o.Person).Where(o => o.PersonID == id && o.CurrentHousing == true).FirstOrDefault();
            person = db.Persons.Find(id);
            newHousing = new OccupiedHousing();
    }
}

public ActionResult Details(int? id)
{
    return View(new HousingDetailsViewModel(id));
}

[HttpPost]
public ActionResult Move(OccupiedHousing newHousing, int? personID, int? housingID)
{
    newHousing.PersonID = personID;
    newHousing.DateArrived = DateTime.Now;
    newHousing.CurrentHousing = true;
    newHousing.AvailableHousingID = housingID;
    db.OccupiedHousings.Add(newHousing);
    db.SaveChanges();


    return RedirectToAction("Index", new HousingViewModel());
}