Health Data of Bases and Buildings

UNSC Base

Firebase + 0 x building = 1.0
Firebase + 1 x building = 2.0

Firebase + 3 x building = 4.0

Station + 0 x building = 1.5
Station + 1 x building = 3.0

Station + 5 x building = 9.0

Fortress + 0 x building = 2.0
Fortress + 1 x building = 4.0

Fortress + 7 x building = 16.0

NOTE : Building type does NOT give any health boost to UNSC base
NOTE : Turrets do NOT give any health boost to UNSC base
NOTE : It takes 1.5 suicide grunt squads to take down Firebase 0 x building, 3 x for Firebase with 1 x building and 6 x for Firebase with 3 x building

UNSC Buildings

Supply Pad = 1.0
Heavy Supply Pad = 1.5
Barracks = 1.5
Vehicle Depot = 1.5
Air Pad = 1.5
Field Armory = 1.5
Reactor = 2.5
Advanced Reactor = 3.9

Covenant Base

Outpost + 0 x building = 2.0
Outpost + 1 x building = 2.0

Outpost + 3 x building = 2.0

Keep + 0 x building = 4.0
Keep + 1 x building = 4.0

Keep + 5 x building = 4.0

Citadel + 0 x building = 8.0
Citadel + 1 x building = 8.0

Citadel + 7 x building = 8.0

NOTE : Buildings do NOT give any health boost to covenant base
NOTE : Turrets do NOT give any health boost to covenant base
NOTE : It takes 3 x suicide grunt squads to take down Outpost, 6 x for Keep and 12 x for Citadel

Covenant Buildings

Warehouse = 1.0
Blessed Warehouse = 1.0
Temple = 2.0
Hall = 1.2
Factory = 1.2
Summit = 1.2

NOTE : Warehouse and Blessed Warehouse have same amount of health
NOTE : Upgrading Temple does NOT give any health boost

Source of information you have found?

I measured it. O.o It is accurate enough to make conclusions. For example when attacking against UNSC Firebase one should target buildings down before focusing to the core building. Against covenant one has to consider does he/she have enough time/firepower to take the core down. If yes, then destroy it. If no, then destroy buildings.