KuraiDeuce is correct there. The builing is the Golden Scepter and inside they sell all the crafting books from 51-60 and also all the app2 spells and combat arts from 51 - 60. The books will be a little more expensive then if you purchased them in one of the faction houses (coin, blades or truth), but they are all there in the one large building... kind of like a costco!
As far as being attacked in Maj'Dul, without any faction at all, the only things that will aggro on you are the gamblers and the bandits. The gamblers hang around in groups near the walls of the city but are all intent on their gambling games and so won't bother you unless you stray too close to where they are playing. They're static mobs so just give them a wide berth.
The bandits are wanderers who comb the back alleys and shadowy places and to my knowledge, never come out into the streets so stay away from those places and you'll be fine.
On the rare ocasion that someone flips the faction of the city to "tears", all the guards will be replaced and the streets will be filled with wandering bands of orcs and thieves. When this happens, we are all out of luck! It's kinda like walking smack into a riot!