How to terminate a section 8 lease (month to month) in Colorado?

[Jane S.]

Im interested in a duplex with one section 8 tenant paying way under what rent should be for the location. (Other unit vacant) The tenant has a m-to-m lease. I would be even more interested if the seller would terminate this tenant's occupancy. I have heard that section 8 tenants can sue landlords, which takes weeks, meanwhile they are living there. And maybe not paying rent. And maybe they win the suit. The local Housing Authority is not available to chat with me so hope I can get a better POV here. HUD may be involved as well. Thanks.