That won't fly under GDPR. The building owner should give you consent form:
You consent to:
- [ ] Your data will be processed by police department
to fulfill your request.
- [ ] Your data will be used to help with ongoing investigations*/**/***.
- [ ] Your data will be used to better evaluate information
coming from you****.
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* - by consenting you agree to be included in department's suspect list.
** - by consenting you agree to have data shared with all other government
agencies, as well as private investigators listed in Appendix A.
*** - by consenting you agree to have your data shared with select journalists
(listed in Appendix B), as well as any and all social media profiles
of the department.
**** - by consenting you agree to be randomly searched and detained if the department
determines a need for it.
</font>
Appendix A:
[redacted due to national security concerns]
