Radio based networking devices, input needed

Hey everyone,

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I am helping at a small non-profit association with all things IT, including their network. They got a very basic setup that was implemented by a number of people. Documentation was never written and even passwords are mostly lost. I need some input / ideas / suggestions for this problem:

They got two offices, about 30m apart across a courtyard. There is no clear line of sight between the offices due to a smaller building structure in the courtyard. Both offices are on street level or thereabouts. The obstructing structure is two storeys high with a flat roof.

Currently they use TP-Link Pharos devices to connect the networks of the offices which works OK, but network connection issues are frequent. The NAS is situated in one office and needs to be accessed by both offices. I would normally setup a VPN between the LAN of the offices, but connection speeds make this solution not feasible (at least not preferable). The simplest solution of this may be pulling a cable or fibre across, but I understand this to be not possible.

I lack experience with radio based networking devices and need your help. I understand devices like Ubiquiti airFibre require an unobstructed view between two connected devices. Are there solutions able to provide reliable connections across this relatively short distance but with an obstructed view via radio or anything else? Obliviously the price of the solution needs to be affordable, but I would be happy to invest in some reliable gear.

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Any suggestion would be greatly appreciated. Thanks everyone.

Cheers