When valuing multiple units, what should an appraiser avoid doing to prevent inaccuracies?

The practice of assigning a total value based on individual unit values without adjustment is generally flawed when valuing multiple units, as each unit may be influenced by various interrelated factors. Appraisers must consider the dynamics of the market, such as supply and demand relationships, the potential for economies of scale, and the impact that one unit's value may have on another.

For example, if multiple units are valued separately and added together, this could lead to an over-valuation because it doesn't take into account any synergistic effects of the portfolio of units being valued together. Additionally, adjustments may need to be made for differences in size, location, or condition among the units that wouldn't be accounted for if simply summing individual values.

Thus, a thorough appraisal would involve assessing how the units relate to each other as part of a holistic valuation process instead of treating each unit in isolation. This leads to a more accurate depiction of the total value based on the actual market conditions and behaviors affecting all units involved.