This is really bad. The way that employers abuse their employees, just not to "waste" money and build a new office for new employees.
Well the hype days are over so I think that you can only bite your tongue and move on. In better days, let's say 4 years ago, I would gone to that employer and throw the resignation letter on his desk and quit working in the same day.
The employers nowadays abuse their employees, because they know how much a job is hard to find and how important it is to maintain a job.