An alternative is to get them to agree to mediation / arbitration but it sounds like she just doesn't want to sell anymore.The language in the paragraph you copied basically makes repair of any 'violations' a condition of the sale and contemplates three options; 1) The seller repairs violations2) The contract is canceled with refund of deposit and specific expenses3) Contract if fulfilled with a $500 abatement in price for non-repaired violations (I assume you sent the requisite notice for this option)From what little I know, specific performance is difficult to win.

@Atwan Kwan I doubt that if it went to court or mediation, that the apartment community would win, IF the tenant truly gave his sixty day written notice 

If the tenant and the landlord can’t agree on a reasonable amount, the dispute will have to be decided in court, or resolved in an arbitration or mediation proceeding (see page 46).RISKS: The defects may not be serious enough to threaten the tenant’s health or safety.If the tenant withholds rent, the landlord may give the tenant an eviction notice (a three-day notice to pay the rent or leave).

The tenant said she just couldn't live there and I let her out of the lease, she constantly felt sick, so I let her out of the lease.It's a free country if they want mold test that's up to them.If it shows there is a problem then you'd probably have to pay for that and re-mediate the issue, but I'd start first with the areas you know need addressing, and yes make sure all the ventilation systems, including A/C filters and drains are working properly.If they want out of the lease..

I am mediately started getting sick while in the apartment.

I believe my tenant's autistic son is already under a program where he receives help.I have spoken to the neighbor already and intend to talk to my tenant about the situation, mainly as a mediator.

If you go to a higher court, try to access a mediator who isn't worried about their political skin.

I do this all the time for clients and friends, as it makes it easier and more enjoyable for all parties involved, and has a mediator in the transaction. 

One of the reasons we didn't purchase a double here in Cleveland was because they are historically very difficult to sell if you want to get out of the business.They were also way too expensive 4 yrs. ago and the idea of mediating tenant disputes with each other was more than we were ready for.

So it would go to mediation first.