We like the simplicty here, but the large angle on top starts looking like the roof of a house or a mountain or something. I think we would like to have the logo more abstractly just represent the "2" and not also try to be something too identifiably "architectural". We're not crazy about this particular design, but its clear to us that you understand what it is we are looking for, so we'd really like to see something else from you.
Right now #39 is our favorite of your designs. The difficulty is that we want the 2 to read as a 2. Its okay if its not immediately obvious that its a 2, but we don't want it to be mistaken for somthing else. For example, 36 looks like a Z, 34 and 35 look like an S and 37 and 38 look like eyes.
Also, the rounded font that you use is a bit too playful. We'd like to see some more elegant font styles.