We have any vacancies in Mattapan, Dorchester, Brocton area. Rents vary per room. Landlords seek First Month, Last Month and dome security deposit as well. Realtor fee is equivalent to one month rent of unit rented. You will have to have 3 to 4 months rent to move in. First Month, Last Montj, ( some require security which will be paid back at end of rental term barring excessive damage to property) also my fee as a Realtor equivalent to one full months rent. Rents range from $650- $1100 depending on size, location and landlord.