In my limited reading, it appears that there are some limits on this so that people don't skirt the gift tax, but I am sincerely looking for some insight.Much appreciated!

The couple is fresh out of college and appears they've never had their own apartment(s) aside from college dorms, if that. 

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So I found a site that tracks rental trends in the Spokane area: Spokane rental trendsIt looks to me like 3% is not an unreasonable rent increase over the past 3 years, in fact it appears to be closer to 4% per year.

.$$$$ appear...

I'll be in town for business on a property I own, but I have interest in a few I've found off the web.

The main thing to be careful of is not charging more or appearing to charge more based on family size, family make-up, or other fair housing attributes.