Minor nitpicks:
"The exception to this is a 1.2 km long pathway leading from the elevator entrance to SCP-2249-1," - sentence ends in a comma instead of a period.
"Entrance to SCP-2249 is through an elevator on the first floor of the hospital, in which is a single tree (Pseudotsuga menziesii) on a bed of grass." - Why is there a species name for the tree, but not the grass?
Major nitpicks:
The concept is interesting, but it's got way too much telling instead of showing with regards to the contents of the dimension. What I mean is, you sort of say, "Here's a thing, and here's another thing, and here's another thing," without going into any real detail about them. It stops being atmospheric, stops letting us explore a new world, and starts feeling like a list. I'd like to see the bloated version of this, I think it'd be better, because right now it's paired down too much.
The biggest offender is the "apparent tears" in space paragraph, in which the article rattles off that there are tears in space "apparently." Wait what? What does that mean? What does a tear in space look like that you can say that something "apparently" is one? The article rattles off that there are holes in reality with the same tone as saying that there's a bed of grass. Was this written by someone who sees tears in space every day with the same frequency as grass?
Another example: the article goes from saying, "Multiple constructions can be seen," to then later mentioning off-hand that there's a town there. Saying there are "multiple constructions" is different from saying that there's an entire town. That wasn't clear. There's a lot of details that get glossed over, like you're in a rush to get to the next thing. Notice how the entire town this guy constructed gets as lengthy a description as the interior of the elevator. Take your time, the appeal of this SCP is the bizarre alternate universe.
This would be remedied either with an exploration log or just going into more detail about the contents of the dimension, especially the town and the house.
Also, the video logs of the scientist currently add nothing to the story. The concept of a failed dreamland for children turning into a radioactive nightmare zone is fertile ground for tragedy, and making us feel for the doctor and his wishes to create a paradise for children would add a great emotional punch, but the logs just sort of repeat what we already know.
No vote. It's a great concept, but the execution needs a lot of retooling.