. :)Looking forward to the read regardless, anytime a qualified person can give you tips on their subject, like a CPA or attorney for $20.00, I'd say take it, you might send them a Christmas gift too!

Offer them a $25 or $50 gift card at a local restaurant for every showing, they'll bite (p).

I like to send Christmas gift cards around Christmas, but as stated above, if you're a responsive landlord who fixes things quickly and considers their concerns, that will help you the most.

They think they are God's gift to humanity and do not want to pay anything.

Only the gift of desperation (if you're lucky!). 

You give them $5-10,000 for the option to buyor a gift for move expenses, (you can have this deducted from the original purchase price upon acting on the option to purchase.

I'm with @David Halprin on this one. 13 year tenants could use a bit of a gift.

If they are selling to you at $80k below FMV, the IRS may see that as a "gift" and you'll be responsible for paying taxes on at least a portion of it.

From what I've heard in the US, the down payment can not be a gift. 

Just cutting the child a check without issuing a W-2, without potentially reporting on the applicable Form 94x series (and state equivalents), without having a completed I-9 and signed contract on file...if I was an IRS auditor I'd deny the deduction, and claim the checks were gifts, and you'd have a very hard time proving me wrong.Unless the child is going to be working a lot in your business, the juice may not be worth the squeeze here.