At the request of The Tolmans who commented on my last post, I'm going to talk a little about temple additions.
The St. George Utah Temple had a stair addition on the rear of the temple. This didn't alter the symmetry (as other temple additions have) and blends in fairly well with the temple. It isn't a perfect addition. Details such as window style give away that it is a 1970s addition. There is also an annex with dressing rooms, etc. that is white, but otherwise doesn't match the original temple.
The Logan Utah Temple has been completely gutted and rebuilt on the inside. At the same time a stair tower was added to the center of the north side. Unfortunately, this ruins the original symmetry of the temple, and the windows don't match the original temple. The stone is a fairly good match. The temple originally jutted out slightly in the same location as the current stair tower (I'm not sure if this was from an earlier stair addition). In that case, the extension had a circular window that looked nice. The original annex also matched the stone of the main temple and was castellated. I'm not sure why they replaced that annex with a cream 1970s style annex that obviously doesn't match the time period of the original temple. But when the Logan Temple was remodeled in the 1970s, little, if any, attention was paid to historical details or matching styles. This is painfully apparent on the inside which looks nothing like the exterior would suggest.
The Manti Temple used to have a drive through tunnel beneath the east towers. This has been blocked off now and parts of it can be seen near the current women's dressing room. Otherwise I am only aware of the current annex addition with dressing rooms. In this case, it matches the temple stone and the annex interior matches the styles present in the rest of the temple.
The Salt Lake Temple has had a sealing room annex added (on the right side in this picture). This addition is 2 stories tall and is found on the north side of the temple. This ruins the symmetry of the original temple, and the windows don't quite match those found on the original temple. Even so, this addition blends fairly well and was needed to increase the number of sealing rooms from 3 to 14.
The Boise Idaho, Chicago Illinois, and Dallas Texas Temples were overcrowded upon opening. Each was remodeled within a few years. The additions present some problems. In at least Dallas and Boise you go to the chapel and then you go back through the dressing rooms to get to the endowment rooms. This is awkward and obviously wasn't the original plan for the building. Boise's addition isn't the most balanced. I remember Dallas' addition doing a better job of preserving symmetry. In addition, one of the formerly detached spires is now in a lobby with glass skylights providing a nice view. I haven't been to the Chicago Temple, so I am not sure how the addition works there.
The Monticello Utah Temple was originally built with just one endowment room, one sealing room, the celestial room, and a baptistery. It was so small because it was a test small temple. Shortly after completion, the temple was expanded and now looks like most other first style small temples, although the window elevations change along the building, giving away that there is an addition. Similarly, the Anchorage Alaska Temple was originally built small and has since been expanded. This gives it a different look.
I've surely missed some temple additions. I've noticed that most additions haven't done the best jobs of preserving the original architecture (they ruin symmetry, windows don't match, rooms and corridors don't flow right afterwords). Still, most aren't overly offensive, and a few work.
Comment and let us know what you think.