The office/warehouse makes most sense to me, but there is also the Motorcycle Club and you can become a drug kingpin.

Decent overview here

https://www.reddit.com/r/gtaonline/comments/936rob/new_to_gta_here_is_a_guide_to_businesses/

Word on the street is that this week's property discount will be....


Nightclubs! Drat!

Looks like dat warehouse will run me full price.

No, now go away or I shall taunt you a second time!