Make constant but ultimately trivial changes, such as how the desks are arranged, or cosmetic changes to the hierarchy, which will direct people's attention into the current thing to gossip about, as opposed to paying attention to the general structures of work itself: alienation, coercion, meaninglessness, bureaucracy, competition, etc.
Isolate the office as much as possible from nature: build it in the middle of the city where there isn't even a hint of green in sight, bright lights so that people cannot tell whether it is day or night, air conditioning so that people don't notice when it is hot or cold. You're looking to recreate a more socially acceptable version of a casino: an inside that is so disconnected from anything outside that even time does not seem to pass as it normally does, and one where people perform tasks completely mechanically, without any conscious intent whatsoever.
Deliberately err on the side of too much control, too little freedom, too much work, too much bureaucracy, so that you may relieve it in some minute ways when you feel like it—and therefore be thanked for it—or by “asking” workers about their opinion, thereby giving your workers the illusion that their conditions are getting better. What you’re looking for is thus to create a form of Stockholm's syndrome in them.
Always speak as if you and your workers are on the same side, and that whatever difficult decisions you make are, of course, for the good of the company, and not whatever personally benefits you.
Create some type of visible motto or symbol, to give the illusion that there is some type of coherent principle or value that governs the decisions of the company, instead of doing whatever is easiest or earns the most profit for whoever is in charge at the present moment.
Frequently schedule activities, meetings, phone calls, whatever you can think of, that will disrupt any productive flow, or long stretches of time that would allow people to think about their life. What you're aiming for is constant doing, even if that leads to decreased productivity, because obedience matters far more than competence or solving actual problems.