What should I have in my assassin's bureau?
Most Bureau's function as news post and informational military base, which means you can live there. It can be a place to store weapons, food, drink and waters/wines (not to dine on but medicines and also flame lighting materials), as well as other medicines, bandages and cots for sleeping and or blanket rolls for sleeping.
Thread, twine, string, flax, needles
Cloth, bandages, sheets, linens
Glues, pitch, nap (a type of black pitch), saps, salves, ointments
Foods, nonperishables (rare), bread, cheese, wines/liamints (fruit juices)
Candles, wax, tonement (for sealing wax, clays, pottery), pottery bake (cornstarch, baking soda (medly), flour, meal
Bed rolls / blankets / mats / cots
Wood, firepots, pits, snap (kindling), fax (fat for burning/oil), and Fax is a templar word.
Fishing net / fishing cap. You could take an old shirt, and cutting small holes in it would filter water, you could "dress" the shirt onto two poles and it would be propped up in a place to let water filter through it. Or people would take a longer sleeve shirt after dressing the two poles and tie the arms together to make a net, and fish would be gathered from inside the shirt they swam into.
Brooms / rock salt for floor (kept bugs and pests at a mini), and sometimes people knew how to weave a floor mat from twine or grasses. (Not pretty things)
Cooking oil from foods gathered for lamp oil and candle making. Lasted anywhere between 35 mins to 3 hours depending how it was made. People would take red wine, and mix it with the oils, and it would last over a period of hours if the flax wix or wood wick was long enough. Only noble people had white wines.
Most bureaus are brave enough to post the assassin logo somewhere on the or about the property. In some times past, it was Illegal to have the insignia on the wall, door or roof or sign, in front or around the side of the buildiing or in the back. Bureaus then resorted to the use of the Jerusalem Cross in order to signify they were good people of the mark. Many also took to create a cross on their robe or uniform. Usually a red, or white emblem with yellow or black trim and some white.
Pope Clement III basically told bureau's they could not post signage of any logo or establishment, or they would be fined money, he feared "briganides" moving against him. This lasted until the middle of the 1200's, and in the north did new bureau's start to post signage out-front and also on their roof.
It is important to note that early bureaus were modeled after Monasteries. The idea of a home, peace, prayer and help in the monastery was greatly admired by early Assassins. If you study this article, you will see that this is true:
Rule of Saint Benedict - Wikipedia
It is also clear up from Pope Clement III's death the Catholic Church instigated most of the wars of the lands until and past Pope Gregory's IX rule.
Pope Gregory IX - Wikipedia