FusionTech, a leading tech company specializing in quantum computing, is based in downtown San Francisco, with its headquarters situated In a multi-tenant skyscraper. Their office spans across three floors. The cutting-edge technology and the proprietary data that FusionTech possesses make it a prime target for both cyber and physical threats. Recently, during an internal security review, it was discovered that an unauthorized individual was spotted on one of the floors. There was no breach, but it raised an alarm. The management wants to address this vulnerability without causing too much inconvenience to its 2000+ employees and the other tenants of the building.
Given FusionTech's unique challenges, which measure should it primarily consider to bolster its workplace security?