Multiple gmb listings with one business?

There’s techniques out there that allow you to have multiple gmb locations within your city all without having a physical location. Anyone know how to achieve this?

Rent out a virtual office in a building that offers that service.

They'll often have a service that allows them to forward mail to you or you can go pick it up. They allow you to list your business address as one of their tenants that way.

If you haven't been bulk verified, there's a limit to the number of business listings you can create and own per Google Account. You can create and own a maximum of 100 listings created prior to October 2017 (including Google+ brand pages and YouTube channels).

However, there's no maximum limit for listings created from October 2017 onwards. You can create and own any number of listings created from October 2017 onwards.