The same percentage of low-income units must be retained for 99 years.
The rest would be low-income units reserved for the mutual housing association.
The low-income units could be part of their developments or built elsewhere.
Rents for the low-income units will be about $303 to $496.
Proposals are already being taken from private developers to build the other 200 low-income units.
Housing advocates say the project would mark a small but significant step toward the county's goal of building 10,678 new low-income units by 2015.
Rents for the low-income units are $321 to $613 a month.
The seminary site would have 24 of the low-income units.
Rents for the low-income units are to be $300 to $600 a month.
Rents for the low-income units will be $332 to $510.