This listing includes AI condition scoring, neighbourhood intelligence, and market valuation data — giving you a complete picture before you visit. Compare rental yield, price per square metre, and location strength against the broader Portuguese market to assess whether this property fits your investment strategy.
4-bedroom, 3-bathroom penthouse of 340 m². Located on rua Dona Isabel de Aragão, 17, Queluz e Belas parish, Sintra municipality, Lisbon district. Noteworthy Features: The penthouse boasts three expansive terraces, including a covered marquee space with a barbecue, enhancing outdoor living and dining experiences with stunning sea views. Additional Detail: A rare 60 m² private garage adds significant convenience for urban living in the region.
The valuation. The asking price of €685,000 is below the fair value of €805,529, indicating a significant opportunity of €120,529 (17.6%). This penthouse is positioned favorably in a market where similar properties are often priced higher.
Fair value modelled at €805,529 from the area baseline, adjusted for condition and location. Asking €685,000 sits €120,529 (17.6%) below — the upside to fair value.
Asking €685,000 versus the rua Dona Isabel de Aragão, 17 area baseline of €729,640 (€2,146/m²) for a median-condition unit of this size — the gap before quality adjustments.
AI Condition Index 76/100 (Condition 70 · Materials 80 · Room dimensions 78). Above-median finish quality lifts fair value versus a baseline unit needing CapEx.
Neighbourhood score 74/100 (Housing Market 70 · Amenities 70 · Economic 80 · Tenant Quality 75). Strong amenities and housing-market momentum support a premium to baseline.
rua Dona Isabel de Aragão, 17
Area baseline €729,640 + condition +€5,844 + location +€70,045 = modelled fair value of €805,529 (€2,369/m²), a €120,529 (17.6%) gap versus the €685,000 asking price.
| Reference | Status | Price | €/m² | vs subject | Condition | Location |
|---|---|---|---|---|---|---|
| rua Dona Isabel de Aragão, 17 | Subject | €685,000 | €2,015 | — | 70 | 74 |
| Massamá e Monte Abraão · 001bff | Active | €525,000 | €3,052 | 51.5% | 70 | 68 |
| Massamá e Monte Abraão · 4a7ee9 | Active | €375,000 | €3,099 | 53.8% | 74 | 76 |
| rua António Quadros | Active | €485,000 | €3,540 | 75.7% | 75 | 78 |
| rua Mário Pinto, 13 | Active | €550,000 | €3,293 | 63.5% | 73 | 77 |
| Median comp | €505,000 | €3,196 | 58.6% | 74 | 77 |
Long-term rental The 4-bed penthouse in Queluz e Belas is subvalorizada, presenting a gap of 17.6% under its fair value of €805,529, which enhances its potential for long-term rental returns despite a current yield of 0%. With favorable public transportation links and a neighborhood score of 74/100, it is positioned well for reliable tenant quality and consistent rental demand. Family rental Given its spacious area of 340m² and proximity to essential amenities, this property is an attractive option for family rentals, despite being subvalorizada by 17.6%. The 76/100 condition rating suggests it is well-maintained, making it appealing to family tenants seeking comfort and accessibility. Buy-and-hold This penthouse represents an opportunity for a buy-and-hold strategy, with its valuation gap indicating it is subvalorizada at €685,000 compared to the fair value of €805,529. The property’s location in a suburban area with good transport links supports its long-term appreciation potential, making it a strategic investment for future returns.
Market Vulnerability The economic stability score of 80 suggests a relatively strong market, but the tenant stability score of 75 indicates potential volatility in tenant retention, which could impact cash flow stability.
