About the OBOA
We are guardians of a better built Ontario.
OAA Invalidation
| Invalidated as of | Name | Seal No. | |
| 05112018 | Nicholas Rassenti | 3413 | |
| 2018-05-14 | Kamal N. Habib | 7185 | |
| 2018-05-03 | Martin M. Poizner | 1637 | |
| 2018-09-17 | Melina Craig | 6630 | |
| 2018-06-30 | W. Carson Woods | 2301 | |
| 2018-10-02 | Mohammad Mohebbi | 4658 | |
| 2018-10-25 | Ovidio Sbrissa | 3339 | |
| 2018-10-03 | Peter A. Gabor | 2917 | |
| 2018-09-20 | Nathan Minch | ||
| 2018-10-02 | Timothy R. Tracey | 8654 | |
| 2018-10-02 | Marek J. Radojewski | 3938 | |
| 2018-12-13 | Arthur Muscovitch | 2733 | |
| 2018-09-20 | Daniel Libeskind | Temporary Licence for "L" Tower and ARTSLAB CENTRE project | |
| 2018-12-11 | Lubomir Dzamba | 8937 | |
| 2019-02-01 | David Ronald Muphy | 4358 | |
| 2019-06-19 | Angus Skene | 5648 | |
| 2019-05-02 | Stephen Jacob Pyrkosz | Temporary Licence for Toronto MC- Viscount project | |
| 2019-04-12 | Alex Fok | 6071 | |
| 2019-04-12 | Bronwyn Fitz-James | 5304 | |
| 2019-04-12 | Gabriel Rivest | 8658 | |
| 2019-02-13 | Toby Rayman | 2435 | |
| 2019-07-09 | Mazen Alkhaddam | 6408 | |
| 2019-10-06 | Rolf Seifert | 8537 | |
| 2016-02-01 | Allan Barrett | 3955 | |
| 2020-01-08 | Mahdieh Haji-Ghassemi | 8538 | |
| 2020-01-02 | Amer Jordan | 8940 | |
| 2020-06-23 | Ken Kruck | 5148 | |
| 2019-12-05 | Amanda Elliott | 8895 | |
| 2020-10-10 | Sameh Aly | 9058 | |
| 2020-11-30 | Keith David Benjamin | 5476 | |
| 2021-01-05 | Robert J. Crothers | 3950 | |
| 2020-12-18 | Robert E. Lorimer | 3778 | |