Politics. Wired high speed internet requires shorter distances between the ISP's box and your house, and so in suburbia they need to put little boxes down the street at closer interviews for high speed internet. Local city councils block these for reasons: local residents complain about the boxes ruining the look of their street, or simply don't want tech workers to displace them and make rents go up.
Gigabit internet exists in select neighbourhoods, but expect to pay a rent premium for it. Ask the leasing agent what ISPs are available before applying; if their property offers gigabit fiber optic you can bet they'll be happy to tell you they've got Fiber Optic from Sonic or AT&T. If you get the usual "AT&T and Comcast", then stay away.
