A blacklight flashlight will help you find the areas to address, then treat with an enzymatic cleaner, like natures miracle.

Clean the air ducts professionally, change any porous surface including blinds. Baseboards and some drywall may need to be replaced too. Air it out all day every day as well. Prime with Zinser Bin and paint every surface. Paint cabinets and replace appliances. They get behind there and spray/pee. You’ll never get rid of the smell until everything’s replaced. It’s the worst!

Odo Ban or vinegar may help

Blacklight to find all sources then cut out and remove drywall, doors, baseboards/trim, tack strips, cabinets (anything the urine touched). You CAN NOT surface clean this out. Ozone machine for 2-3 days with no one present then let air out and seal with kilz or pet treat surrounding areas. Replace all removed items and areas. It's costly and time consuming, but only way to really get smell out. As mentioned before, don't just enzyme treat and cover up as this never works.

You can run an ozone machine you can also put an odo ban around the HVAC unit. But there is also websites that have floor solutions that break that smell up if needed. I know their are professional services but they do the same stuff that is OTC. You made need to replace flooring and get the concrete underneath sealed

If you are using a professional carpet cleaning service they should be able to help you. Be prepared, it’s not cheap.