Landlord is selling the property. What are my rights?

Question Details:

I rent a condo in a 4-plex in Iowa and my landlord put the property on the market. I have a very simple month-to-month lease that states I pay $450/month. The realtor is advertising to potential buyers that they can charge up to 650/month and that we currently pay $550/mo. If the property is sold, what happens to my current lease and my security deposit? Can the new landlord charge whatever they want for rent? What kind of notice do they have to give me and what rights do I have? Important Notice