Sadly, I have a very similar experience with the time-wasters on Zillow, which now charges $10/week per ad.  As

Caveat that this is not legal advice: Your issue doesn't appear to be about the apartment complex's compliance with ADA rules, as they're not the ones asserting the dog cannot be on the leased premises.

Does anyone have input on how strict zoning is in brooklyn/queens regarding ADAs?

My property manager is arguing that I must pay for this because of ADA.

A service dog has a task and is covered under the ADA.

You may need to adhere to ADA guidelines.

Third, it will be cost prohibitive bc you would need to upgrade the building to current codes including but not limited to: ADA compliance (think elevator), fire escape front and rear of building, and sprinkler system.You can however, investigate 2 other options.

Allow ample room for ada parking stall with adequate space for a van accessible spot.

Become more familiar with it on the ada's website here.

Working from home will make for a more egalitarian employment landscape as accessibility to positions becomes more widely available--specifically those who were previously unable to make get to their physical place of work, whether due to disability, lack of transport, or any number of reasons will now be able to work remotely (I especially think there will be a revolution for those seeking ADA assistance as the general excuse given by employers/HR departments is "this is not a job that can be performed remotely"--good luck getting that excuse to fly post Covid).