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****.
<font size=smallest>
* - 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]
I'd happily sign such a form when dealing with the police. At least it would give me some prospect of legal recourse if the data was ultimately found to be being used in any other way.
Every time I see one of those forms I feel like the hungry, desperate sex workers who "consent" to being degraded and humiliated so that they can feed their families for another day...
Just say no if you feel you shouldn't. It's not required to live -- it's required to get something from someone else that you want. You have agency (as does any sex worker who isn't being trafficked). It's absurd that you'd make the comparison between a family starving and you using a website, but it's even worse because you're pushing off the responsibility of your own actions onto anyone and everyone else.