Colusa, Cal., Code of Ordinances ch. 22 § 22-4

(a) The planning commission may require additional information necessary to assist in evaluating said conversion project in order to make proper findings in accordance with the purposes and objectives set forth in the adopted General Plan, or any specific or community plan or element thereof in effect at the time of such application. Such information may include, but shall not be limited to:
(1) A report comparing the units in the conversion project, as both rentals and ownership units, with housing available within the community plan areas affected by the project;
(2) A report on availability of comparable rental units at similar rental rates remaining within the affected community plan areas, including vacancy rate information;
(3) When dealing with low income housing, a report outlining the available low and moderate income housing units (rental and sales housing) within the affected community plan areas;
(b) The planning commission shall consider the following topics in determining whether to approve an application, and may disapprove any application which is felt not to fulfill them appropriately;
(1) An evaluation of the average rental vacancy rate in the affected community plan areas and in the building proposed for conversion. The commission shall consider the rental history of the building, including the number of evictions and increases in rent over the preceding three years. In addition, the following sources of vacancy rates statistics may be used:
a. Department of Finance (State of California).
b. Postal Service.
c. HUD vacancy rates.
d. Any other reasonable means which is accepted by the commission as a true assessment of vacancy status.
(c) In evaluating rental vacancy rates outside of the proposed conversion unit, particular concern should be directed towards comparable housing. In determining whether the housing to which applicant proposes relocation is "comparable" the commission must find that the housing is decent, safe, and sanitary, and in compliance with all local and state housing codes; and that the housing is open to all persons regardless of race, creed, national origin, ancestry, religion, marital status, or gender. In addition the commission shall consider the following factors in determining whether the relocation housing is comparable:
(1) Whether the housing is provided with facilities equivalent to that provided by the landlord in the dwelling unit in which the tenant resides in regard to each of the following:
a. Apartment size including number of rooms.
b. Rent range.
c. Major kitchen and bathroom facilities.
d. Any special facilities.
e. Willingness to accept families with children.
(2) Whether the housing is located in an area not less desirable than the area in which the tenant then resides in regard to:
a. Accessibility to community and commercial facilities.
b. Accessibility to the tenant's place of employment.
c. Accessibility to schools and public transportation.
A unit is not comparable if it is located in a building for which a notice of intent to convert has been given, except where the rental units of the building will not be offered for sale as condominium units within two years.