public static async Task<PoisByBuilding> GetPoisByBuilding(string buid)
{
RequestPoisByBuilding r = new RequestPoisByBuilding();
r.access_token = "api_tester";
r.buid = buid;
var response = await AnyPlaceClient.PostAsJsonAsync(new Uri(ServerBaseUri, "anyplace/mapping/pois/all_building"), r);
var buildings = await response.Content.ReadAsAsync<PoisByBuilding>();
IsDirty = true;
return buildings;
}