Learning about different problem solving strategies and when to use them will give you a good start. Problem solving is a process. Most strategies provide steps that help you identify the problem and choose the best solution. There are two basic types of strategies: algorithmic and heuristic.
It should be 'No vacancies' (plural). Vacant means empty/free. Vacancy is the state of being empty, therefore 'no vacancies' = no empty rooms.
Multifamily Real Estate Vacancy. In commercial multifamily real estate, vacancy is an important topic. Vacancy rates and occupancy rates go hand-in-hand. In the purest of terms, vacancy rates or physical vacancy is the number of empty units divided by the total number of units in a given property. Occupancy, on the other hand, is the number of occupied units divided by the total number of units.