MultiFamily Market Outlook - 10/17/2006 (Plain Text Version)
In this issue:
Apartments Have Positive Impact on Property Appreciation Rates
One of the more common barriers to multifamily housing is a presumption on the part of local stakeholders that it will have a negative impact on their property values, especially values of single-family homes. New data recently released from the Census Bureau confirm, however, that this presumption is yet another myth about multifamily housing. In fact, NAHB’s latest analysis of the 2005 American Housing Survey data shows that, on average, single-family homes located near multifamily communities actually appreciated at a higher rate than homes that did not have multifamily neighbors.
Interestingly, there is no evidence that multifamily housing causes single-family house prices to decline over the long-term, although there is some indication of slightly reduced appreciation rates close to the time multifamily housing is first built. Compensating for this, however, is a somewhat higher rate of appreciation in subsequent years, so that after three or four years the cumulative appreciation on single-family homes is essentially the same whether or not an apartment building had been built in the neighborhood in the meantime.
The Source of the New Data
The AHS is conducted in odd-numbered years by the U.S. Census Bureau, and receives funding from the Department of Housing and Urban Development’s budget. The survey is based on a nationally representative sample of U.S. housing units. Because the AHS revisits the same homes every two years (augmenting the sample with new construction) and records the value of the same property at different points in time, it can be used to compute rates of appreciation.
One caveat: Home values recorded in the AHS are owners’ estimates of how much their properties are worth at the time of the survey, which may raise questions about the accuracy of the estimates. Several academic studies have looked into this, and have invariably found that although owners’ estimates of value are not completely accurate, they tend to be off by a percentage that does not vary in any systematic way with characteristics of the house or the persons occupying it. (The more recent studies find that owners tend to overstate the value of their homes by a relatively constant percentage.) This implies that appreciation rates computed from the AHS values will be unbiased. (For example, if a home’s value is overstated by 8% in two different years, the rate of appreciation measured between those two years will not be affected by the overestimate.)1 There are other possible sources of error in the data, and the appreciation rates reported in this article are calculated after taking several steps to screen out inaccurate values.2
Another feature of the AHS is that it identifies whether or not certain structures are present within a half block (defined as approximately 300 feet) of the unit surveyed. This enables us to calculate different appreciation rates for single-family homes based on the presence of neighborhood features such as nearby apartment buildings.
Appreciation if Multifamily is Present at the Start of the Period
Table 1 and Figure 1 show appreciation rates for single-family detached homes in various time periods between 1997 and 2005. They also show different rates, depending on whether apartment buildings were present in the neighborhood at the start of the period or not. The 1997-2005 period in particular is examined, because the Census Bureau changed the way it collected neighborhood data in 1997. Starting with that year will produced an analysis based on data collected in a consistent manner.
The numbers in the figure and table are average annual appreciation rates. For example, the appreciation rate of 6.9% for 1997-2005 means that the increase in the price of an average single-family home between 1997 and 2005 was the difference that would result if the price increased at a rate of 6.9% every year. Of course, it’s no surprise to anyone who follows housing markets that appreciation rates were higher than this in the more recent past. The average annual appreciation rate for single-family homes between 2003 and 2005, based on the AHS data, was 12.1%.
For each of the time periods shown in Table 1 and Figure 1, appreciation was higher for single-family detached homes if they were in neighborhoods where apartment buildings were present at the start of the period. For example, single-family homes in neighborhoods where multifamily structures were present in 1997 appreciated at a rate of 8.3% between 1997 and 2005. Single-family homes in neighborhoods where multifamily structures were present in 1999 appreciated at a rate of 10.2% between 1999 and 2005, compared to 8.1% for single-family homes that were not near apartment buildings, and so on.
This is consistent with results reported previously by NAHB based on earlier releases of AHS data. This doesn’t actually prove that building a multifamily building will cause nearby single-family homes to appreciate at a faster rate. An alternate explanation that is also consistent with the data is that areas where markets are growing and housing demand is generally high are places where house price appreciation continues to be above average and where there has been pressure over the years to use land more intensively and build taller structures, such as apartment buildings. Even under this alternate scenario, though, apartment buildings are likely to be fulfilling an important function as part of a healthy economic environment—providing housing for a certain segment of the population in areas where high and increasing prices may price them out of the market for single-family detached homes.
Appreciation if Multifamily is Built During the Period
The above statistics may not satisfy all critics, however. A possible concern is that, while single-family homes appreciate at a healthy rate once an apartment building already exists in the neighborhood, the initial building of the building triggers a one-time reduction in house prices. Even if appreciation were later to resume its normal rate, this hypothetical one-time reduction would be a concern to owners of existing single-family homes in the neighborhood.
To investigate this, Figure 2 compares average annual appreciation rates for single-family homes over the 1997-2005 period based on whether apartment buildings were introduced sometime after 1997 or not. For comparison, the figure also shows appreciation rates if commercial buildings or manufactured housing were introduced during the same time interval.
The first thing to notice is that there is no evidence of house prices declining when one of these features is introduced after 1997, although the comparison does show lower rates of appreciation. For apartment buildings, however, the difference is very small—6.6% vs. 6.9%. The difference in appreciation rates if commercial buildings or manufactured housing are introduced is more pronounced.
Table 2 and Figure 3 take this a step further and break the numbers down based on when during the 1997-2005 the neighborhood features were introduced. As the table and figure show, all of the reduction in appreciation is concentrated among single-family homes where multifamily housing (or manufactured housing or commercial buildings) was introduced in 2004 or 2005. Because the appreciation is based on a final house price measured at some point in 2005, this may include cases where the apartment building is still under construction, where landscaping is not yet complete, or where the building has not yet become fully occupied.
Moreover, the effect on appreciation where apartment buildings were introduced in 2004 or 2005 is quite mild compared to the effect observed in when commercial buildings or manufactured housing were introduced.
In summary, the 2005 AHS shows that, in cases where apartment buildings are already present within a half block, single-family detached homes appreciated at a faster rate between 1997 and 2005. This is true no matter which time interval within the 1997-2005 period we look at.
In cases where apartment buildings were introduced into the neighborhood after 1997, single-family appreciation rates were somewhat lower. However, the effect is small compared to the effect of introducing commercial buildings or manufactured housing, and is confined to cases where the apartment buildings were introduced after 2003—so that construction may have been still in progress when home prices were measured in 2005. In cases where apartment buildings were introduced into single-family neighborhoods between 1998 and 2003, any reduction in appreciation that may have initially occurred seems to have been completely offset by subsequently higher rates—so that single-family detached homes appreciated at close to an average annual rate of 6.9% between 1997 and 2005, irrespective of any multifamily structures built nearby between 1998 and 2003.
1. Eight percent is the highest figure reported in the published literature. The reference is Kiel and Zabel, “The Accuracy of Owner-Provided House Values: the 1978-1991 American Housing Survey,” Real Estate Economics, 1999.
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