| Clue | Source | Date |
|---|---|---|
| Building-safety regulations | Newsday | 10 Jan 2018 |
| Building regulation | Universal | 30 Apr 2017 |
| Building regulation | ||
| *Building inspector's concern | LA Times Daily | 14 Dec 2016 |
| *Building inspector's concern | ||
| Rules for building | Universal | 25 Sep 2015 |
| It sets occupancy limits | New York Times | 28 Aug 2015 |
| Rules for building | ||
| It sets occupancy limits | ||
| Exit specifications, e.g. | ||
| Building inspector's concern | ||
| Architectural guideline | ||
| Architectural guideline | ||
| Building inspector's topic |