| Answer | Crossword Clue |
|---|---|
| ELL | Building annex, sometimes |
| ELL | Building annex |
| WING | Building annex |
| ADDN | Building annex: Abbr. |
| ELL | Right-angled building annex |
| IVY | Building overgrowth, sometimes |
| SLAB | Building foundation, sometimes |
| ELL | Building addition, sometimes |
| ELLS | Building additions, sometimes |
| ELL | Building wing shape, sometimes |
| DONOR | Name on a building, sometimes |
| SUBBASEMENT | Lowest floor of a building, sometimes |
