1. What determines the size of the key-money payments that landlords demand (and tenants offer) for the right to rent a controlled apartment?

2. Who, other than the owners of rental units, loses as a result of rent controls? Who gains from rent controls? What effect would the imposition of rent controls have on the market price of an existing single-family house? What effect would rent controls have on the value of vacant land?

Last two questions on my Economics homework, please help? Thank you in advance!!