Section 99.110 - Authority may join or cooperate with other authorities or with private entities - certain authorities not to establish additional units, when1. Any two or more authorities may join or cooperate with one another in the exercise of any or all of the powers conferred hereby for the purpose of financing, planning, undertaking, constructing or operating a housing project or projects, or other federally subsidized housing programs located within the area of operation of any one or more of said authorities. An authority may also provide technical assistance to other authorities and charge a fee for such services, provided that the profits from such fees shall be distributed as provided in subsection 3 of section 99.080.2. An authority may provide technical assistance to public and private developers of housing for persons of very low, lower or moderate income and charge a fee for such services, provided that any profits from such fees shall be distributed as provided in subsection 3 of section 99.080.3. An authority may participate, with other public or private entities, in partnerships, joint ventures, or other co-ownership arrangements as long as the profits from such participation are distributed as provided in subsection 3 of section 99.080. If a housing project is the subject of the participation, at least twenty percent of the units shall be occupied by persons of very low or lower income. The distribution of project units reserved for persons of very low and lower income by size shall be proportional to the distribution of units by size for the entire housing project.4. An authority which participates with a private entity, in a partnership, joint venture or co-ownership arrangement in the development or the management of a housing project for which the property has been acquired by the power of eminent domain and results in the displacement of persons and/or businesses, shall establish written policies and procedures for the payment of displacement and relocation benefits to such affected parties.5. No authority in any city partially contained within a county of the first class having a charter form of government with a population in excess of four hundred thousand inhabitants shall create in whole or in part, directly or indirectly, any additional housing units within any area that is within two and one-half miles from the center of any other area having a radius of one-half mile that contains more than five hundred housing units subject to any provisions of this chapter. Excepted from this subsection is any area that formerly contained multiple building high rise public housing.