R&D Lab

 is unlocked after completing the job Accept The Job For A Top-Secret Mission in Bloemfontein.

The allows you to build Consumables for use throughout the game. The amount of Consumables you can build within each build period varies depending on the property level, and resets back to maximum every 18 hours. You can build 1 consumable for level 0.5 to 1 star, 2 consumables for 1.5 to 2 stars, and so on. You may build any combination of the consumables available up to the maximum allowed for your property level within the 18 hours period.