The term "rental property investment" refers to an investment that includes purchasing real estate, then holding, leasing, and selling it. To profit from their rental properties, investors require a specific degree of skill and knowledge, depending on the kind of rental property. Most leasable properties, such as a single unit, a duplex, a single-family house, an entire apartment complex, a commercial retail plaza, or office space, are considered real property. Industrial properties may also be utilized as rental properties in certain circumstances. Due to several variables resulting from the bigger size, more commercial rental assets, such as apartment complexes or office buildings, are more sophisticated and harder to evaluate. It is common to estimate greater maintenance and repair expenses for older buildings.