The terrain is an oblong of undeveloped land behind the terrace. The house rests partly on the terrace, and partly on the terrain.

The terrain texture
click to select the terrain object.
The terrain is easiest to see if the viewport is shaded. If it isn’t, press F3 to turn on shading.

Terrain object selected in the Top viewport
(Show Standard Map In Viewport)
to turn it on.
(Assign Material To Selection).
The map doesn’t appear in viewports yet because the terrain object is also an editable mesh, and requires a mapping modifier.
Modify panel, choose UVW
Map from the Modifier List drop-down list.
The map is now visible in shaded viewports.

Planar mapping is appropriate again, in the case of the terrain. Turn off Real-World Map Size for UVW Map.
The map still appears to be squashed: This is because the original texture is square, while the terrain object is oblong. You can fix this by cropping the map.
Cropping/Placement group,
click the View Image button.
3ds Max Design opens a Specify Cropping/Placement dialog. It displays the map, surrounded by a red box with square handles. You can move the box, or use the handles to resize it.


Close the Specify Cropping/Placement
dialog.
Cropping/Placement
group, click Apply to turn it on and apply the cropping. (Make sure
Crop and not Place is the option chosen just below the Apply toggle.)