After you encounter the village in the desert, return home. You'll get an event where the Sharance tree randomly grew a second floor. Now go to the blacksmith and talk to Raven (Or whoever's behind the counter. Not very sure if it works if Gaius is the one there) and she'll offer your a choice to build a workshop and a pharmacy.
You need a few thousand gold and about 50++ wood though.
You'll get it as you progress through the story. Or rather, the option to get one will be enabled.
Wait until your treehouse thing grows to get a 2nd floor, it'll happen on its own after the first boss, and then you purchase the pharmecy in town from that crazy medicine girl with the horn. --- Phantasy Star Zero: 4813 0853 0645 Mario Kart DS: 1246 6432 9834
Go into the 2nd floor, Shara will enter and talk. Pharmacy/Forge/Workshop unlocked! Oh, and it has nothing to do with love levels. --- "I have chortles at the misleading of your topic! It is like a book that should be read backwards when it tells you not to!" - Frankie123457