Very simple to do.1) In the hole you, spray some suspend sc insecticide inside the hole. https://www.amazon.com/Suspend-Insecticide-USA-Supply-Eradic...2) Get a beekeeper suit, just in casehttps://www.amazon.com/Professional-Ventilated-Sheepskin-Bee...3) cut open the area.4) Spray inside the entire wall the suspend SC5) Dry out and close up the wall.If this cost you $200 and some time, I'd be amazed. 

Permethrin SFR Insecticide 36.8 % for inside the building where you had the termite issue. 

Ex: If a tenant calls up to complain that their drain is broken or running slow, or that a light fixture needs replacement, or to spray the Apt with insecticide, or to fix a broken door-lock or window frame, or anything of the like such as the fast repairing, touching up, painting & cleaning needed during a turnover between Tenancies...

We cleared the building for six hours and fogged all units, put poison in every unit including inside walls and left all tenants with a do-it-yourself insecticide purchased off Amazon.The specialist brought to my attention another unit that was pretty dirty.  

I have a cousin who died due to an epileptic seizure they think was triggered by an insecticide “bomb.”

Take responsibility for them - go to local grocery or hardware store and get an insecticide spray and get after them.

Applications of insecticides targeting the adult stage are not efficient.

They are not contractors so they sub contractor work out, they only do the pesticide/insecticide treatments so the rates are much higher than you can do.I see many termite reports showing some very minor drywrot damage and bids of $900 to fix it, yet it costs me less than $100 to fix it.

Get insecticide into the ant nest to destroy the colony.

Just incase there were any straglers, I left contact kill insecticide for tenants to use.