Your 15% or 25% down offer in this market, is basically the same as an all cash offer in markets like what you describe, so you might be able to pick up real estate at a discount simply by having two nickels to scrape together. 

Then apply a "courtesy discount" or credit against whatever you're charging and refund the deposit with interest as required by law.You're within your rights to discount your receivables on a case-by-case basis.

I think it's more common in markets where properties are selling at such steep discounts.

Additionally, Insurers like professionally managed properties and you may get a discount for using one.

You may need to forgo the extra due to the season, move in special discount maybe?

If a real estate investor came to you and wanted to sell you a volume of cash flowing properties, would you want to pay a premium, or would you want a discount for buying in bulk?

Do you have vendors that give discounts on services like these?

We've purchased it at a pretty good discount base on comps for the area.

Each punch was worth $10, so at the end of their lease they would get the sum of the punches as a discount on that months rent. 

If you make an offer for the property to be vacant upon sale, then I as another investor will come along and offer to take this problem off the current landlord's hands, perhaps at a discount!