Hi, I see you are using the iD editor. For your five new buildings, you first need to join the corners of the buildings. Select/highlight one building, drag a corner node onto the corner node of the adjacent building, release it, it should stick/join the two corner nodes together, (test by again dragging the joined node, it should drag the corners of both buildings. Repeat for all corners to be joined. 

Once the corners are joined you can square up the five house block. The houses have to be fairly square to start wih. While holding down the Shift and Ctrl keys, left click the mouse on each house to highlight/select all of them, release the Shift and Ctrl keys, all houses should remain selected. Now hover the curser over one of the outlines, right click the mouse, click the square icon, (forth one down). They should all square up.

Regards Bernard.