When Monica and Ed are standing in the Deline's back yard, the Montecito and it's signature waterfall are clearly visible. This facade of the Montecito faces west. However, in previous episodes, including episode 4 of season 3, (the dog show) it is indicated that the Delines live in Henderson, which is southeast of where the Montecito is located. Therefore, the depicted view is impossible from Henderson.
The view depicted in this episode is more consistent with the Deline house being located in Summerlin, to the west of The Strip. In addition, the expensive home the Delines live in is consistent with the upscale area of Summerlin.