Reflecting on the experience of calculating yields for several properties in Rapid City, it becomes clear that even within the same city, the ratio of purchase price to rent varies significantly from property to property. Following a budget of around $300,000, it becomes clearer how to approach calculations when selecting income-generating properties in this city.

The average home value in Rapid City is $365,969 according to Zillow (as of May 31, 2026, a 1.9 percent increase from the previous year). The median rent is reported as $1,300 per month by Zillow, while other research organizations report it as high as $1,443 (as of July 2026), indicating some variation among properties. Using the lower figure of $1,300 to calculate the total yield for the first property results in an annual rental income of $15,600, yielding about 4.3 percent when divided by the purchase price.

The second property has a slightly lower purchase price but also lower rent, resulting in a total yield that is not significantly different from the first. However, when calculating net operating income, the differences begin to emerge. The average effective property tax rate in South Dakota is around 1.09 percent (as of 2026), which is somewhat higher than neighboring mountainous states. For a home priced in the $360,000 range, this could mean an annual property tax of around $4,000. Given the relatively high proportion of property tax, even with similar purchase prices, the cap rate can vary based on the assessed value of the property tax.

Applying the 50 percent rule to both properties to estimate net operating income and compare cap rates can sometimes flip the rankings of the two properties that appeared similar in total yield. Adding loan conditions to calculate cash-on-cash returns introduces a third variable. Since actual cash flow varies based on down payment percentage and interest rates, it can be helpful to organize total yield, cap rate, and cash-on-cash returns when comparing properties side by side.

Even after comparing the cap rates of the two properties, one cannot overlook the bigger picture of total returns. To get closer to actual investment performance, one must also consider asset appreciation due to loan principal repayment, potential capital gains, and tax benefits from depreciation. In areas like Rapid City, where the increase in purchase prices is gradual, it is important to consider how the ranking of the two properties may change based on how long one plans to hold them, in addition to immediate cash flow indicators.

Rapid City benefits from a balanced mix of tourism, military bases, and healthcare industries, which helps ensure that rental demand is not overly concentrated in one sector. However, the city is not large, so there are not many properties available, and vacancy rates can vary significantly by neighborhood. Therefore, when comparing the two properties, it is advisable to also review recent rental data for each area.

When comparing the cash-on-cash returns of the two properties with actual numbers, even with the same down payment percentage, differences in assessed property tax values can lead to variations in net operating income, which in turn affects cash flow relative to the actual investment amount. Developing a habit of organizing these detailed items in a table when reviewing properties side by side can ultimately lead to better choices. If decisions were made based solely on total yield without such detailed comparisons, it is likely that the actual cash flow experienced during the holding period would differ from expectations.

While Rapid City is known for having stable rental demand, it is important to carefully examine regional variations due to the limited number of properties available. If Korean families are choosing areas based on school districts, it is recommended to check the GreatSchools rating and the assigned school for the specific address before making a purchase. Families relocating from other states should also consider that property tax rates and insurance structures may differ from their previous residences. This article does not constitute investment or legal advice, and it is advisable to consult with professionals before making any actual contracts.