The Dekalb County Assessor's Office is located in Sycamore, Illinois, and is responsible for assessing the value of over 70,000 parcels of real estate in the county. The Assessor's Office uses a variety of methods to estimate the value of properties, including the sales comparison approach, the cost approach, and the income approach. The sales comparison approach involves comparing the property being assessed to similar properties that have recently sold in the area. The cost approach involves estimating the cost to replace the property, taking into account depreciation and other factors. The income approach is used for commercial and industrial properties and involves estimating the income that the property is expected to generate. Property owners in Dekalb County are required to file a property tax return with the Assessor's Office every three years. The return must include information about the property, such as its size, age, and condition. The Assessor's Office uses this information, along with other data, to determine the value of the property. Property owners who disagree with the value assigned to their property by the Assessor's Office can appeal the decision. The appeal process involves filing a written appeal with the Dekalb County Board of Review. The Board of Review will then review the appeal and make a determination. If the property owner is still not satisfied with the decision, they can appeal to the Illinois Property Tax Appeal Board or file a lawsuit in circuit court. The Dekalb County Assessor's Office is located in Sycamore, Illinois, and is responsible for assessing the value of over 70,000 parcels of real estate in the county. The Assessor's Office uses a variety of methods to estimate the value of properties, including the sales comparison approach, the cost approach, and the income approach. The sales comparison approach involves comparing the property being assessed to similar properties that have recently sold in the area. The cost approach involves estimating the cost to replace the property, taking into account depreciation and other factors. The income approach is used for commercial and industrial properties and involves estimating the income that the property is expected to generate. Property owners in Dekalb County are required to file a property tax return with the Assessor's Office every three years. The return must include information about the property, such as its size, age, and condition. The Assessor's Office uses this information, along with other data, to determine the value of the property.