If your tenants have lived in the home for 12 months or more, then 60 days notice prior to sale is required. If they have lived in the home 12 months or less, then 30 days notice is appropriate. Make sure your notice is given in writing and try to take into consideration your tenants concerns with regards to showing the property. I also recommend that you speak with an Attorney that specializes in Real Estate law just to make sure you have all your ducks in a row. Good luck!