Notice to terminate lease law change HELP!!!

[Jeffrey K.]

Hi,

I have some tenants on a month to month lease that have not paid rent. Therefore, I would like to terminate their lease. The problem is that I am finding conflicting information online. The Colorado landlord/tenant handbook says I only have to give 10 days notice pursuant but  C.R.S. § 13-40-107 says 7 days. However, I have found a newer bill SB17-245 that says I have to give 21  day notice. Both can be found on colorado.gov sites. I did notice that section 1 of the SB bill says "without a written agreement" for rent increases. Is that true for section 2? 

I know this is a technical and sticky question, but I would be really appreciate any help!