Colo. Rev. Stat. § 10-3-218
Domestic insurance companies may invest in real estate for the accommodation of the company's business, but the aggregate investments by a company that may be admitted assets under this section shall not exceed fifteen percent of the company's admitted assets unless the commissioner has given prior approval of a greater aggregate investment. Any space in the company's home office building that is not required for its use may be rented to others. The commissioner may approve investments under this section which in the aggregate will not exceed twenty percent of the company's admitted assets, upon a finding that such investments do not render the company's operation hazardous, or its condition unsound, to the public or its policyholders.
C.R.S. § 10-3-218