Rebuild is a free online flashgame by Twin Towers. You command a group of survivors, and need to reclaim the city from zombies. Each building you recapture can be used in some way, or turned into something else.
Edit: I recently received an email telling me the game is no longer available at the above link, but it is available here. It does require flash, so I'm not sure how long it will remain playable.
8-12 Mart - can become a bar or a laboratory.
All-Mart Store - gives 25 extra defence, once defences are built.
Apartment Building - gives room for fourteen survivors. Can become a school.
Bar - Adds 5% happiness. Can become a laboratory.
Big Farm - gives 12 food per turn.
Church - adds 5% happiness, as long as you hold the building. Can become a hospital
City Hall - required for the constitution ending.
Evil Graveyard - required for the close the evil portal ending.
Farms - produce 6 food per turn. Can be turned into suburbs.
Graveyard - absolutely pointless.
Hospital - Prevents death from illness in the settlement. Can be turned into a church. Only one required.
Laboratory - used for scientific discoveries. You need three to get the Cure ending. Can become a church.
Mall - adds 25 defence, once defences are added.
McNoodles - can become a church or a hospital.
Motel - can become an apartment or a school.
Office - can be turned into a school or an apartment building.
Park - can be turned into a farm.
Parking Lot - can become suburbs or a farm.
Police Station - adds 25 defence. Can be used to set who's guarding the fort each day.
Rubble - can become suburbs or a farm.
School - Can train three people in a new career as a builder, leader, scientist or soldier. Can be turned into an apartment building.
Suburbs - can house 9 people. Can be turned into suburbs.
Trailer Park - can become a farm.
Warehouse - can be turned into a church or hospital.
XXor Gas - can be replaced with a bar or a laboratory.
(I wrote this to remind me of what to aim for).
8-12 Mart - can become a bar or a laboratory.
All-Mart Store - gives 25 extra defence, once defences are built.
Apartment Building - gives room for fourteen survivors. Can become a school.
Bar - Adds 5% happiness. Can become a laboratory.
Big Farm - gives 12 food per turn.
Church - adds 5% happiness, as long as you hold the building. Can become a hospital
City Hall - required for the constitution ending.
Evil Graveyard - required for the close the evil portal ending.
Farms - produce 6 food per turn. Can be turned into suburbs.
Graveyard - absolutely pointless.
Hospital - Prevents death from illness in the settlement. Can be turned into a church. Only one required.
Laboratory - used for scientific discoveries. You need three to get the Cure ending. Can become a church.
Mall - adds 25 defence, once defences are added.
McNoodles - can become a church or a hospital.
Motel - can become an apartment or a school.
Office - can be turned into a school or an apartment building.
Park - can be turned into a farm.
Parking Lot - can become suburbs or a farm.
Police Station - adds 25 defence. Can be used to set who's guarding the fort each day.
Rubble - can become suburbs or a farm.
School - Can train three people in a new career as a builder, leader, scientist or soldier. Can be turned into an apartment building.
Suburbs - can house 9 people. Can be turned into suburbs.
Trailer Park - can become a farm.
Warehouse - can be turned into a church or hospital.
XXor Gas - can be replaced with a bar or a laboratory.
(I wrote this to remind me of what to aim for).