Resale Project Scorecard
Castle Green
D26 · Mandai, Upper Thomson · 99-year leasehold · completed 1997 · 664 units
Grade A, 7.00 out of 10, the 6th highest score among 14 resale condos in District 26.
How to read this grade. RPS is a relative comparison of seven scored factors, not a valuation, return forecast or buy recommendation.
TRIBE's 2026 back-test found the composite separated later resale returns less clearly than Historical Performance alone, so the grade should be used to open the factor details, not to close a buying decision. Read the evidence →
- Lease left, about
- 66 yrs
- Resales, 12 months to Oct 2026
- 17
- To Lentor MRT
- 370 m
3D model: block outlines © OpenStreetMap contributors, roof heights from OneMap 3D (SLA)
Castle Green Score
- A
- Grade
- Score out of 10
- 7.00
- Highest score among 14 resale condos in District 26
- 6th
Strong project with clear strengths. Standout strengths: project size, MRT access. Key weaknesses: rental yield, future transformation.
Project's Historical Performance25%7/10
Avg Ann. of +3.62% — near-median performance within its 1997-era cohort (62nd percentile).
The district median is 7/10.
Primary School Effect20%7/10
2 primary schools within 1km (nearest: Anderson Primary School at 0.05km). Strong school proximity — a genuine advantage for young families.
The district median is 7/10.
- Anderson Primary School
- Mayflower Primary School
Within 1km on OneMap's School Query for at least one block, the measure MOE uses for Primary 1. Check your block's postal code on OneMap School Query →
Project Size16%10/10
664 units — ideal scale for liquidity and facilities without crowding. Typically the sweet spot for resale turnover.
The district median is 5/10.
MRT Proximity13%9/10
370 m from Lentor MRT (TE5) — direct, walk-in MRT access. Strong commuter appeal.
The district median is 8/10.
Rental Yield10%4/10
Rental yield of 3.18% — below-average income return.
The district median is 4/10.
Tenure10%5/10
99YR tenure — about 66 years remaining; some long-term decay exposure but not imminent.
The district median is 10/10.
Future Transformation6%3/10
Limited future-catalyst exposure — nearest is Ang Mo Kio MRT CRL interchange (CR11, CRL1) at 2.10km, far enough that the impact on this project is modest.
The district median is 3/10.
Scores updated October 2026. On the map →
Why Castle Green scores 7.00
Castle Green scores 7.00 out of 10 on the TRIBE Resale Project Scorecard, Grade A, ranking 398th of 2,350 resale condos scored in Singapore and 6th of 14 in District 26 (Mandai, Upper Thomson). Its strongest factors are Project Size (10/10) and MRT Proximity (9/10); its weakest is Future Transformation (3/10).
| Factor | This condoCastle Green | DistrictDistrict median | EffectEffect on score | Scores above |
|---|---|---|---|---|
| Project's Historical Performance25% | 7/10 | 7/10 | ±0.00 | 38% of district |
| Primary School Effect20% | 7/10 | 7/10 | ±0.00 | 46% of district |
| Project Size16% | 10/10 | 5/10 | +0.80 | 92% of district |
| MRT Proximity13% | 9/10 | 8/10 | +0.13 | 69% of district |
| Rental Yield10% | 4/10 | 4/10 | ±0.00 | 38% of district |
| Tenure10% | 5/10 | 10/10 | −0.50 | 0% of district |
| Future Transformation6% | 3/10 | 3/10 | ±0.00 | 46% of district |
Medians are across the 14 scored resale projects in District 26 (Mandai, Upper Thomson). “Effect on score” is the factor's weighted difference from that median, so the column sums (to within rounding) to the gap between Castle Green and a median-profile project (6.57). “Scores above” is the share of those projects this one out-scores on the factor. Weights and bands are on the methodology page.
Castle Green Prices
By unit type at Castle Green
| Unit type | Size | Sold for | Median PSF | Sales |
|---|---|---|---|---|
| 2-bedroom947 sq ft | 947 sq ft | $1.24M to $1.37M | $1,372 psf | 7 |
| 3-bedroom1,152 sq ft | 1,152 sq ft | $1.50M to $2.31M | $1,402 psf | 8 |
| 4-bedroom1,410 sq ft | 1,410 sq ft | $2.15M | $1,529 psf | 2 |
Past transactions at Castle Green
17 resales, Nov 2025 to Oct 2026 · median $1,381 psf · $1,238,888 to $2,308,888 · 14 of the 14 with a purchase on record sold at a profit
| Sale | ||||||||
|---|---|---|---|---|---|---|---|---|
| 11 Aug 2026 | 485 Yio Chu Kang Road | 4 | #04-02023BR · Blk 485 | 3BR | 1,152 | $1,414 | $1,628,888 | Resale |
| 20 May 2026 | 487 Yio Chu Kang Road | 13 | #13-15154BR · Blk 487 | 4BR | 1,410 | $1,532 | $2,160,000 | Resale |
| 17 Apr 2026 | 481 Yio Chu Kang Road | 2 | #02-09092BR · Blk 481 | 2BR | 947 | $1,372 | $1,300,000 | Resale |
| 1 Apr 2026 | 487 Yio Chu Kang Road | 4 | #04-03033BR · Blk 487 | 3BR | 1,152 | $1,441 | $1,660,000 | Resale |
| 1 Apr 2026 | 487 Yio Chu Kang Road | 2 | #02-06063BR · Blk 487 | 3BR | 1,216 | $1,283 | $1,560,000 | Resale |
| 31 Mar 2026 | 485 Yio Chu Kang Road | 13 | #13-06064BR · Blk 485 | 4BR | 1,410 | $1,525 | $2,150,000 | Resale |
| 26 Mar 2026 | 483 Yio Chu Kang Road | 7 | #07-03033BR · Blk 483 | 3BR | 1,152 | $1,389 | $1,600,000 | Resale |
| 12 Mar 2026 | 481 Yio Chu Kang Road | 3 | #03-12122BR · Blk 481 | 2BR | 947 | $1,446 | $1,370,000 | Resale |
| 12 Feb 2026 | 485 Yio Chu Kang Road | 3 | #03-09092BR · Blk 485 | 2BR | 947 | $1,321 | $1,250,888 | Resale |
| 10 Feb 2026 | 487 Yio Chu Kang Road | 4 | #04-16162BR · Blk 487 | 2BR | 947 | $1,375 | $1,302,000 | Resale |
Show as a table
| Period | Sales | Median PSF | D26 |
|---|---|---|---|
| Nov 2025 | 3 | $1,306 psf | $1,646 psf |
| Dec 2025 | 2 | $1,420 psf | — |
| Jan 2026 | 2 | $1,319 psf | — |
| Feb 2026 | 2 | $1,348 psf | $1,509 psf |
| Mar 2026 | 3 | $1,446 psf | $1,933 psf |
| Apr 2026 | 3 | $1,372 psf | $1,960 psf |
| May 2026 | 1 | — | $2,190 psf |
| Jun 2026 | — | — | $1,958 psf |
| Jul 2026 | — | — | $1,783 psf |
| Aug 2026 | 1 | — | $2,367 psf |
| Sep 2026 | — | — | — |
| Oct 2026 | — | — | — |
A month is plotted from two sales up; the district line from ten.
Sellers here made a median +4.2% a year, ranked 4 of 6 in D26 and 187 of 715 condos. See the most profitable condos in D26 →
URA REALIS resale and sub-sale caveats, Nov 2021 to Oct 2026. Check one unit →
Castle Green Rent
- Median rent a month
- $3,400 to $5,100
- Gross yield
- 2.8% to 3.3%
- Rental contracts
- 66
| Unit type | Median rent | Most rents | Gross yield | LetsContracts |
|---|---|---|---|---|
| 2-bedroom | $3,400 | $3,320 to $3,510 | 3.1% | 40 |
| 3-bedroom | $4,400 | $4,000 to $4,600 | 3.3% | 21 |
| 4-bedroom | $5,100 | $5,000 to $5,200 | 2.8% | 5 |
Rental contracts at Castle Green
66 contracts, Sep 2025 to Aug 2026 · median $3,600 a month · $2,700 to $5,200
| Month | Type | Size | Rent a month |
|---|---|---|---|
| Aug 2026 | 2BR | 900 to 1,000 sq ft | $3,000 |
| Aug 2026 | 2BR | 900 to 1,000 sq ft | $3,450 |
| Aug 2026 | 3BR | 1,200 to 1,300 sq ft | $4,600 |
| Aug 2026 | 3BR | 1,100 to 1,200 sq ft | $4,900 |
| Jul 2026 | 2BR | 900 to 1,000 sq ft | $3,400 |
| Jul 2026 | 2BR | 900 to 1,000 sq ft | $3,500 |
| Jul 2026 | 2BR | 900 to 1,000 sq ft | $3,500 |
| Jul 2026 | 3BR | 1,200 to 1,300 sq ft | $3,850 |
| Jun 2026 | 2BR | 900 to 1,000 sq ft | $3,380 |
| Jun 2026 | 2BR | 900 to 1,000 sq ft | $3,600 |
URA rental contracts. The table above is the 12 months to August 2026. Yield is gross. URA publishes no unit number for a letting.
Castle Green By stack
- Highest, stack 06
- $1,315 psf
- Lowest, stack 12
- $1,062 psf
- Stacks with 2+ resales
- 16
| Stack | Median PSF | Size | Sold on | Sales |
|---|---|---|---|---|
| 01 | $1,239 psf | 947 sq ft | Levels 4 to 6 | 2 |
| 02 | $1,294 psf | 1,152 sq ft | Levels 1 to 8 | 7 |
| 03 | $1,144 psf | 1,152 sq ft | Levels 1 to 8 | 8 |
| 04 | $1,108 psf | 947 sq ft | Levels 1 to 8 | 7 |
| 05 | $1,297 psf | 947 sq ft | Levels 4 to 9 | 5 |
| 06 | $1,315 psf | 1,410 sq ft | Levels 2 to 13 | 6 |
| 07 | $1,209 psf | 1,410 sq ft | Levels 4 to 12 | 8 |
| 08 | $1,300 psf | 1,173 sq ft | Levels 2 to 12 | 9 |
Show the other 8 stacks
| Stack | Median PSF | Size | Sold on | Sales |
|---|---|---|---|---|
| 09 | $1,310 psf | 947 sq ft | Levels 2 to 7 | 8 |
| 10 | $1,312 psf | 1,152 sq ft | Levels 2 to 8 | 6 |
| 11 | $1,167 psf | 1,346 sq ft | Levels 1 to 8 | 3 |
| 12 | $1,062 psf | 947 sq ft | Levels 1 to 7 | 7 |
| 13 | $1,209 psf | 947 sq ft | Levels 5 to 12 | 7 |
| 14 | $1,233 psf | 1,410 sq ft | Levels 1 to 13 | 10 |
| 15 | $1,306 psf | 1,410 sq ft | Levels 1 to 13 | 7 |
| 16 | $1,261 psf | 947 sq ft | Levels 1 to 13 | 9 |
URA REALIS resale caveats, 2022 to Oct 2026. Sun path by facing →
Castle Green Notes
How these numbers are worked out
- Grade A places Castle Green in a relative band under the current seven-factor formula. RPS is a relative comparison of seven scored factors, not a valuation, return forecast or buy recommendation. TRIBE's 2026 back-test found the composite separated later resale returns less clearly than Historical Performance alone, so the grade should be used to open the factor details, not to close a buying decision. Two units can still be very different buys: the asking price, stack, floor, facing and condition decide the outcome.
- PSF against the district: $1,381 psf at Castle Green against $1,957 psf across District 26, medians over 12 months.
- MRT distance is a straight line on the map; the walking route is longer.
- Prices: aggregates of URA REALIS resale caveats, data to October 2026 (Nov 2025 – Oct 2026; the year before is Nov 2024 – Oct 2025, median $1,315 psf). A specific unit's value depends on floor, size, facing and condition.
- By unit type: a price range is shown from three sales up; with two, the figure is the median.
- Past transactions: every resale and sub-sale caveat lodged with URA from Nov 2021 to Oct 2026, newest first; a unit is its storey and stack (#07-18). Typing a unit or a stack lists its sales across the whole span. Profit is the sale price less the seller's own purchase price as the caveats pair them, before stamp duties, fees and loan interest; the gain a year is compounded and shown from one year held. The trend line is the median from two sales up per month, quarter or half-year, the district line from ten. 10Y appears once the dataset runs that far back.
- Rent: aggregates of URA rental contracts, Sep 2025 – Aug 2026, for unit types with three contracts or more; the contract list under the table carries every letting on file, including those with no bedroom count, and URA publishes no unit number for a letting. "Most rents" is the middle half of contracts, shown from five up. Gross yield is a year of the median rent over the median resale price of the same unit type (12 months to October 2026, two sales or more), before maintenance fees, property tax, agent fees, vacancy and mortgage interest.
- By stack: resales from 2022 to Oct 2026, medians per stack. A stack is the last two digits of the unit number, so #05-37 and #08-37 are both stack 37. Stacks with one sale are left out, and prices moved over the period, so read a gap between two stacks as a lead to check, not a rule.
- Factor bars: the black mark on each bar is the district median.
- Score: seven weighted factors. Methodology published.
What the score cannot tell you
- RPS scores the project, not a unit. Floor, stack, facing, renovation and the asking price are outside the score. In the 12 months to October 2026, the 17 resale caveats at Castle Green ranged from $1,283 psf to $1,898 psf: that spread is unit-level variation the score cannot see.
- Historical Performance is a percentile among projects of similar vintage (completed around 1997, within a year or so, widened when the cohort is small). A high score is strong for its age group, not against the whole market.
- The nearest MRT is Lentor MRT (TE5), 370 m in a straight line. The walking route is usually longer, and bus links are not scored.
- Primary School Effect counts the 2 primary schools within 1 km on OneMap's School Query (the school's land boundary to the block's building outline, the measure MOE uses for P1), weighted by recent P1 ballot demand. A school counts when any block is within 1 km, so confirm your own block's postal code before relying on it.
- Scores updated October 2026; transactions to October 2026. Nothing on this page is a valuation or advice on a specific unit.
- Facing decides a unit's morning or afternoon sun, and it varies stack by stack. See the sun path at Castle Green for any facing, date and time → The hours count direction only; the 3D map draws the shadows of the blocks around it.