i think is for the land upvalue with time
if you invest far of the city your land price not grow so high quickly but if you build near the CDB you can gain some profit faster because your not alone be interrested by customer traffic and residentiel/commercial density
after few year you can think about a moved to get the place for a brand new store for your new high tech-value product
in the CES dlc you can make some management of land when your are mayor
you can move propriety where you want
and make some reduction of the farmland price by using farmzone
and use of the mayor tool can do many more good thing for your city
