How to display and edit data in the same view with different models?

Good morning, I hope you can help me with the following problem.

I am doing the CRUD of several catalogs, my back is in wcf and my front is in asp.net mvc. I added the service reference in my asp.net project and I already have the methods done. In the Controller I have two Update methods, in one the ws method is called to display the data and in the other the ws method is expected to be called to update that data.

Here is the controller code...

    public ActionResult Update(int id)
    {
        if (Session["Usuario"] == null)
        {
            return RedirectToAction("Index", "Login");
        }
        else
        {
            ObtenerEdificio resp = obj.catEdificioObtener(id);

            // Mostrar Update
            return View(resp);
        }            
    }

    [HttpPost]
    public ActionResult Update(ActualizaEdificio vm)
    {
        ActualizaEdificio entrada = new ActualizaEdificio();
        entrada.Descripcion = vm.Descripcion;
        entrada.Imagen = vm.Imagen;

        RespuestaGeneral resp = obj.catEdificioActualiza(entrada);

        ViewBag.successMessage = resp.Mensaje;

        // Mostrar Index
        return RedirectToAction("Index", "Edificio");
    }

As you can see, each one calls a different method and model, so that's where the problem comes from. In my Update view I add the model ObtenerEdificioand if the data is displayed, but I cannot add the model ActualizaEdificioin the same view so the data cannot be edited.

Here is the code of my view...

@model AdministraZion.ServiceReference1.ObtenerEdificio

<div class="panel br-20x panel-default">
    <div class="panel-head">
        <div class="panel-title">
            <i class="icon-layers panel-head-icon text-primary"></i>
            <span class="panel-title-text">Editar Edificio</span>
        </div>
    </div>

    @using (Html.BeginForm("Update", "Edificio", FormMethod.Post))
    {
        @Html.HiddenFor(d => d.IdEdificio)
        <div class="box-body">
            <div class="form-group">
                <label for="inputDescripcion" class="form-control-label mt-3 ml-5">Nombre:</label>
                @Html.ValidationMessageFor(m => m.Descripcion, "", new { @class = "ml-2", style = "color:red" })
                @Html.TextBoxFor(m => m.Descripcion, "", new { @type = "text", @class = "form-control ml-5", style = "width:92%" })
            </div>
            <div class="box-footer" style="text-align:center">
                <label for="file-upload" class="subir">
                    <i class="fas fa-cloud-upload-alt"></i> Subir archivo
                </label>
                <input class="block" id="file-upload" onchange='cambiar()' type="file" style='display: none;' name="Imagen" />
                <div id="info"></div>
            </div>
        </div>
        <div class="box-footer" style="text-align:center">
            <button type="submit" class="btn block btn-success mt-3 mb-3" style="width: 30%" name="crear">Guardar <i class="fa fa-plus-circle"></i></button>
        </div>
    }
</div>

So I hope you can help me and tell me how I could do this part and if you have examples or sites that can support me. Thanks.

UPDATE

Here is the code of my WS...

        public ObtenerEdificio catEdificioObtener(int idEdificio)
        {
            ObtenerEdificio resultado = new ObtenerEdificio();
            try
            {
                using (SqlConnection con = new SqlConnection(strCon))
                {
                    using (SqlCommand com = new SqlCommand("pa_catEdificioObtener", con))
                    {
                        com.CommandType = CommandType.StoredProcedure;
                        com.Parameters.AddWithValue("@idEdificio", idEdificio);
                        con.Open();
                        using (SqlDataReader dr = com.ExecuteReader())
                        {
                            while (dr.Read())
                            {
                                resultado.IdEdificio = int.Parse(dr[0].ToString());
                                resultado.Descripcion = dr[1].ToString();
                                resultado.Imagen = Path.Combine(urlBaseImagenesSubidas, dr[2].ToString());
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                guardaLogGeneral("catEdificioObtener Datos", 0, string.Format("{0} , {1}, {2}", ex.Message, ex.InnerException, ex.StackTrace), "WS");
            }
            return resultado;
        }

        public RespuestaGeneral catEdificioActualiza(ActualizaEdificio cliente)
        {
            RespuestaGeneral resultado = new RespuestaGeneral();
            try
            {
                using (SqlConnection con = new SqlConnection(strCon))
                {
                    using (SqlCommand com = new SqlCommand("pa_catEdificioActualiza", con))
                    {
                        com.CommandType = CommandType.StoredProcedure;
                        com.Parameters.AddWithValue("@idEdificio", cliente.IdEdificio);
                        com.Parameters.AddWithValue("@descripcion", cliente.Descripcion);
                        com.Parameters.AddWithValue("@nombreImagen", cliente.Imagen);

                        con.Open();
                        using (SqlDataReader dr = com.ExecuteReader())
                        {
                            while (dr.Read())
                            {
                                resultado.IdRespuesta = Convert.ToInt32(dr["idRespuesta"].ToString());
                                resultado.Mensaje = dr["mensaje"].ToString();
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                guardaLogGeneral("catEdificioActualiza", cliente.IdEdificio, string.Format("{0} , {1}, {2}", ex.Message, ex.InnerException, ex.StackTrace), "");
                resultado.IdRespuesta = 0;
                resultado.Mensaje = "Se produjo un error inesperado: " + ex.Message;
            }
            return resultado;
        }

Here I leave the code of my models...

public class ActualizaEdificio 
{
    public int IdEdificio { get; set; }
    public string Descripcion { get; set; }
    public string Imagen { get; set; } 
}

public class ObtenerEdificio
{
    public int IdEdificio { get; set; }
    public string Descripcion { get; set; }
    public string Imagen { get; set; } 
}