표 4 단위근 검정 결과
| 변수 | ADF | PP |
| Level | Difference (1) | Level | Difference (1) |
| CBD | -1.186 | -8.091** | -1.195 | -8.109** |
| YBD | -1.543 | -8.431** | -1.543 | -8.430** |
| GBD | -3.115 | -4.039** | -2.599 | -7.117** |
| PBBD | -3.130 | -9.461** | -1.543 | -9.461** |
주 : 1) p<0.05.
2) ADF, augmented Dickey-Fuller; PP, Phillips-Perron; CBD, central business district; YBD, Yeouido prime office market; GBD, Gangnam prime office market; PBBD, Pangyo–Bundang prime office market.