Ok, 2 things.
Firstly the texturing is ugly as hell and looks like it uses Torque textures.
Secondly, I see clipping. Thats where 2 faces intesect and are coplanar. Thats bad.
I have nothing against you (if the above seems aggressive) but I am just trying to help you improve.
Some tips...
>Assuming your using constructor, use the album tool and create a new album called "Blockland" and go to the directory Base>data>shapes and press the button to upload all.
>Also make a folder called "Terrains" and upload all the interior image files from base>data>interiors.
>Make sure no object's faces overlap. This prevents the ugly line glitch and saves lag when you have complex interiors.