The aim of this research is to make clear the actual condition on successive change of the management of condominiums including many units in Tokai area, especially focused on the management rules and countermeasures to pets breeding problem. The research was made for 9 housing estates by the way of hearing to the chief of homeowners association or the management staff. Many changes are surely occurred. For example, management rules and the organization of homeowners association are changed because of physical aging, residents' aging and short of the association's budget. The countermeasures to the pets breeding problem are various in each condominium in spite of almost all residents' much dissatisfaction.
