西新井（越谷市）
Data last updated: November 2026 (Land Price Publication 2026, Prefectural Survey 2026, transactions through Q2 2026)
| Area | Avg. residential | ≈ USD/sq ft | Oaza Nishiarai, Koshigaya City is | 1 year | 5 years | Condos per m² | Index |
|---|---|---|---|---|---|---|---|
| Oaza Nishiarai, Koshigaya City | — | — | — | — | — | — | |
| Koshigaya City | ¥152K/m² | $89/sq ft | +3.4% | +12.7% | ¥371K/m² | 86 | |
| Saitama | ¥142K/m² | $83/sq ft | +2.1% | +8.7% | ¥333K/m² | 83 | |
| Japan | ¥120K/m² | $70/sq ft | +2.1% | +8.0% | ¥493K/m² | — |
Sales in the loaded period: Farmland 2 · Land & building 2 · Land 2
| District | Period | Type | Price | Area | Built | Per m² |
|---|---|---|---|---|---|---|
| Oaza Nishiarai | Q2 2026 | Land & building | ¥3.6M | 175 m² | 1968 | — |
| Oaza Nishiarai | Q1 2026 | Land | ¥33.0M | 1,100 m² | — | ¥30K/m² |
| Oaza Nishiarai | Q2 2025 | Farmland | ¥1.0M | 960 m² | — | — |
| Oaza Nishiarai | Q1 2025 | Land & building | ¥7.0M | 160 m² | 1970 | — |
| Oaza Nishiarai | Q1 2025 | Land | ¥4.5M | 500 m² | — | ¥9,000/m² |
| Oaza Nishiarai | Q3 2024 | Farmland | ¥4.0M | 480 m² | — | — |
Land prices are official survey prices (Land Price Publication as of January 1, Prefectural Land Price Survey as of July 1); transactions are MLIT transaction and contract prices. Averages, changes, forecasts and the index are calculated by Fudosan Zukan. All prices in Japanese yen; dollar figures (≈) at ¥158.25 = $1 are for reference. Estimated prices and forecasts on this site are for reference only and do not guarantee actual sale prices or appraisal values. The estimate is not a licensed real estate appraisal; it is an "AI-estimated price" calculated from public land price and transaction statistics. Forecasts are projections, not guarantees.