Would This Classify As Extortion?

Landlord, located in Ohio. Having some tenant issues.

Background: We have a tenant who was well informed that landscaping duties were the responsibility of the tenant before moving in. The multiunit version of our lease that does not include language regarding landscaping was signed, and the tenant discovered that a few months into the lease. We took it on the chin and are taking care of the landscaping for the duration of the lease.

Situation: After discovering our mistake, the tenant made a demand that we discount rent by a considerable amount monthly for them to take care of landscaping duties, and pay them back pay for the months they mowed the lawn. We declined that request, but made a more reasonable counteroffer that didn't include back pay. Tenant declined. After this interaction they filed a complaint with the city for the condition of the building (that hadn't changed since they moved in). City inspector came out, cited us for some loose coax cable in the basement and a loose outlet. No problem, fixed those right away. Tenant has come back again and asked for a monthly discount to take care of a portion of landscaping duties. We again offered our original offer, which we believe is more than fair. They again declined, and in the same message made complaints about the property (woodwork that's in the process of being fixed and leaves that have blown onto the property from neighboring properties). They told us that they would be filing a complaint letter with the city if those things were not addressed immediately. I have no problem fixing issues that arise, but the proximity of the monetary demand followed by a threat to take action feels very close to extortion. And for it to have happened twice now in the same way feels like a pattern. We have had great relationships with all of our previous tenants at this location, which saw tenancies of no less than 4 years each family. Something about this situation just doesn't seem right to me.