If you have Fresnel clearance (ie better then just marginal line of site), and there is not too much interference from other devices, a link of that distance should be trivial by using 2 external directional antennas, as that distance is well less then 1km - indeed you should be able to get more then 5 times that range with a couple of decent antennas (10 x that is not unheard of).
Note that 2.4 gig stuff can "go further" then 5 gig equipment, but there is generally less noise in the 5 gig band.
If its a big city you might be better off just getting a DSL connection put in though, as its a lot less work and will provide you greater reliability - particularly if there is a lot of interference.