The process of cold calling has definitely evolved. When I first started in commercial real estate, data came on microfiche and floppy discs. We used 3×5 cards and a Rolodex to track clients and prospects.
Later, data came in a quarterly printed book of properties, later replaced by an online subscription. Phone booths led to car phones to flip phones and now smartphones. Door-to-door canvassing was easy, but in the security-sensitive world these days, you don’t get in without clearance, or an appointment.
Develop your interest in a relationship with an owner or tenant, not the property, for best results.