Everyone talking about 60GHz, even just the basic Wireless Wire kit for this distance, are absolutely right in line for "what I would do", however, it deserves to be mentioned that this could be frustrating/problematic if there would be
anything between the two antennas.
60GHz, while wonderful in many ways, when it works anyhow, is incredibly sensitive to any form of blockages, and even air is "in the way" of this spectrum (which is why it's so range-limited even with highly directional antennas).
Leaves? Nope. Need a completely unobstructed view. Even glass/windows will severely degrade a 60GHz signal (it reflects and absorbs far more than passes through it.
Rain? Nope. If you're in Florida, as an example, you're guaranteed to be down for at least a few minutes every day at a minimum.
Fog? Nope... or at least severely degraded.
As such, if this needs to work more reliably and you only actually need 100mbps between the buildings, using more a more conventional directional 5GHz AC/AX solution will likely leave you a lot less troubled. Heck, a highly-directional 2GHz N solution would get close to that 100Mbps requirement and punch right through light vegetation like it's not even there.
There are 60GHz kits that include a 5GHz/AC backup in parallel in the same units. That is an easy recommendation for situations that need a reliable connection, will benefit from the increased throughput of a 60GHz solution when it's up, and automatically still "continue to work" in an acceptable way when 60GHz is too degraded. But, if you're not actually going to benefit from a gigabit-link... skip it, honestly.
A last note on safety and installation:
If you've never been involved with outdoor installations before then please do some reading and/or watch some videos first. Lightning protection and general grounding is not optional if you care about either or both of non-living things and living entities. Do not make excuses about temporary solutions for this... "the quick fix sticks" and it's easy to not get back to it to fix it right.
Further, indoor cabling won't at all last when exposed to the sun and elements. Proper outdoor, weather-rated cable isn't optional for anything that needs to last more than a few weeks. Also, drip loops... lol
If this is a very temporary situation, then with 2.4GHz and probably 5GHz, you can get away with just pointing the antennas at each other through windows... that way you don't need to worry about "all of that" above.