Before I forgot, I have more information and pictures.
I need to investigate a bit further, but it seems the 3rd street carbarn was built in 1901...but I have two very different sets of pics, and need to figure out what the heck is going on. You'll see below. In any case, I see now that the Washington Street barn was built in 1925...so it's much younger than the 3rd street barn, but it's long gone.
I should also mention that I know where the Washington Street barn was supposed to be, in the area of 7th and 8th street...but the one book says between 2nd and third which is smack in downtown, and it would be what was a parking lot for many years. I cannot believe that in a bustling downtown, in the Roaring Twenties, that anyone would build a trolley carbarn downtown, only a couple of blocks away from an existing building that never did get knocked down. So, I'll play with that in the coming weeks as time permits.
So, to begin, using the modern street-level picture I posted earlier today, this is a photo from my collection with the doors open, and you should be able to easily see the existing building back then:
Where things get funny is the next pic. Supposed to be the same building, and here's what I think: I believe that this is the view from the Boatlanding side as the building is built in 1901. The smoke stack in the background fits, though, and so it's possible that we're looking at the same 3rd-street-side view, but there are so many structural differences, until I can look again, I really think that this is a view at the Boatlanding side of the same building. It certainly does not look like the same building as the above picture obviously does. This picture is from the Fenton's pamphlet-ish mini book, page 2. This pic is before the building is finished in 1901:
More to come.