Normally we would just use Ubiquiti radios but the site is an apartment community, with no house power on the bldgs. Dropping meters in, is going to be cost prohibitive. Trenching will be a nightmare, due to trees, sidewalks etc. Plus there are roads and sidewalks to cross.
To me, aerial cable seems cheap and cheesy but half the country has communications cable running on poles.
Is there anything really wrong with running CAT5 aerial if using a support wire, proper eye bolts at each end, outdoor rated cable, etc?