equality between wives

Practising equality when taking another wife

Q: A man is married for 15 odd years (with kids) and thereafter decides to take on a second wife. He has provided for his first wife a house of x value however wants to provide for his future second wife a smaller accommodation of lesser value. He says it is safer for her to stay in. The future second wife is not materialistic but his decision without her consent has already left her feeling inferior and she is now unsure about her future with this man. What is the ruling on this and what do you advise?