For less than the cost of a single MantBox AX 15S (list $179) that could route some 500-600 Mbps, you could get a couple SXTsq 5 ac (list $65 each) that can route more like 900-1000.
In any case, the devices need to be outside, modern high insulated windows are generally a very good shield for wi-fi.
If there are esthetical considerations, you could think for only a little more money (list $228), to go 60 GHzm these are (IMHO) better looking:
https://mikrotik.com/product/wireless_wire
Most likely it won’t go through thick windows.
Check:
http://forum.mikrotik.com/t/60ghz-success/176585/1
and:
http://forum.mikrotik.com/t/wireless-wire-rbwapg-60ad-kit-behind-windows-experience/175957/1
http://forum.mikrotik.com/t/which-devices-for-a-wireless-link-between-two-buildings-100m-range/173870/1