How to avoid capital gains when I combine households

[Brian Hawkins]

My fiance and I both have houses in the Denver market.

Her house: About 3500 sq ft in Lowry. $400-500k equity

My house: About 2000 sq ft in Platt Park. $400 or so equity

We want to combine households and live in my house, but we don't want to get hit for the capital gains if we sell hers. We are open to renting her house, but I'm leary of taking on the landlord thing because I don't have experience with that.  I just know there must be a creative solution to this really good problem to have.

Ideas? Directions to look?