Via Gaetano de Castillia: Milan's most transformed street with the lowest returns
In-depth analysis of Via Gaetano de Castillia in the Isola neighborhood. The street ranks fifth out of 4,006 for urban transformation yet dead last for profitability, with a gross yield of 2.80% against a city average of 5.02%.
Via Gaetano de Castillia is the most emblematic case of the paradox between urban transformation and real estate returns in Milan. The street ranks fifth out of 4,006 streets for Urban Transformation, scoring 87.40 points -- more than four times the city median of 16.60. Yet it also ranks dead last in Profitability, with 20.56 points against a median of 48.03. A profile that captures, better than any other, the gap between value created and value extracted.
The epicenter of regeneration
Urban Development scores 81.49 points, eighth place out of 4,006 streets. This is not an abstract figure: the immediate surroundings include Bosco Verticale, Torre UniCredit, Torre Unipol, and Biblioteca degli Alberi Milano. A short walk away, two office towers -- Gioia 21 and Gioia 20 -- are expected to complete by mid-2026. There are 34 completed projects within the street's radius, compared to a city average of 6.28, with another 6 active construction sites, according to sources specialized in urban development.
The platform contains a detailed profile for each urban development project in the street's radius: category, scale, stakeholders, progress and timeline.
This density of interventions has left a visible mark. The Aesthetics index reaches 70.17 points -- top 2.1% in Milan, first among all 36 streets in the Isola neighborhood -- compared to a city median of 31.64. Architectural quality, measured through automated street-level image analysis, confirms what the eye sees: prestige buildings, well-maintained paving, outdoor seating areas.
How many urban development projects are near Via de Castillia?
There are 34 completed urban development projects and 6 active construction sites within the street's radius, totaling 40 interventions. The city average is 6.28 projects per street: Via Gaetano de Castillia exceeds this threshold by more than five times, ranking eighth out of 4,006 streets for Urban Development.
High price, zero yield
A baseline of 10,920 euros per square meter -- a value estimated by the proprietary multi-source model, which integrates institutional valuations, recent transactions and listing prices, and which for any individual property can vary by 30% depending on floor, condition and ancillary spaces. More than double the city median of 4,268 euros and the highest price among all 36 streets in Isola.
But it is precisely this price that crushes Profitability. With an average rent for a one-bedroom apartment at 1,611 euros per month (versus 1,266 city average) and a two-bedroom at 2,589 euros (versus 1,806), rents are above average -- according to data from real estate listing portals. Yet gross yield from traditional rentals stands at just 2.80% -- dead last out of 4,006 streets, less than half the city average of 5.02%. Net of flat-rate tax and property tax, the yield drops to 1.66%.
What is the real estate yield on Via Gaetano de Castillia?
The gross yield from traditional rentals is 2.80%, last place out of 4,006 streets analyzed in Milan and less than half the city average of 5.02%. Net of flat-rate tax and property tax, the net yield drops to 1.66%. The gap is driven by purchase prices that reflect urban transformation rather than housing demand.
The ratio between purchase price and rental income is among the most unfavorable in the city. Rents cannot keep pace with property values that reflect urban transformation rather than housing demand.
Safety: the structural weakness
The Safety index scores 15.60 points, position 3,880 out of 4,006 -- bottom 3% in Milan. The city median is 65.05. Even among its physical neighbors, Via Gaetano de Castillia is among the most exposed: the average of the eight surrounding streets stands at 29.59 points, nearly double.
Safety analysis is based on 27 crime categories monitored street by street -- all available in detail on the platform, with type, frequency and trend. Data is compiled from news reports and institutional sources, with monthly updates.
Is Via Gaetano de Castillia a safe area?
No. The Safety index is 15.60 points out of 100, position 3,880 out of 4,006 streets -- in the worst 3% in Milan. Even compared to surrounding streets, the figure is critical: the average of physical neighbors is nearly double (29.59 points). This represents a significant risk factor, especially relative to the highest price per square meter in the Isola neighborhood.
Within Isola, the street ranks second-to-last out of 36 for Safety. A figure that clashes with the highest price per square meter in the area and a Retail Offering in the top 11.4% citywide, with a shop density double the Milan average, according to geospatial surveys of commercial activities.
The full profile
Via Gaetano de Castillia is a street that has absorbed an unparalleled volume of urban investment in Milan. Social Infrastructure -- spaces for gathering and socializing -- places it at thirteenth out of 4,006 streets, with 69.23 points against a median of 34.06. The overall CityAdvisor Index stands at 52.85 points, sixty-second place -- top 1.5%, well above the median of 43.06.
But the gap between built real estate value and achievable returns is the widest in Milan. And Safety remains a figure that calls into question the long-term sustainability of such a high price per square meter, to be assessed on a case-by-case basis.
Methodology: monograph based on 20 metrics calculated across 4,006 streets in Milan. Period: March 2026. Rankings indicate position in the city distribution (1 = highest value). Data from public and proprietary sources, covering 4,006 streets, 105 metrics and monthly history from January 2020.
Frequently Asked Questions
How much does a square meter cost on Via Gaetano de Castillia?
The estimated price is 10,920 euros per square meter, more than double the city median of 4,268 euros. It is the highest value among all 36 streets in the Isola neighborhood. The figure is calculated through a proprietary multi-source model integrating institutional valuations, recent transactions and listing prices. For any individual property, the value can vary by 30% depending on floor, condition and ancillary spaces.
How much does it cost to rent a one-bedroom apartment on Via Gaetano de Castillia?
The average rent for a one-bedroom apartment is 1,611 euros per month, above the city average of 1,266 euros. For a two-bedroom, it rises to 2,589 euros per month versus 1,806 for the Milan average. Despite above-average rents, gross rental yield is the lowest in the city due to very high purchase prices.
Why does Via Gaetano de Castillia have the lowest yield in Milan?
The gross yield of 2.80% -- last out of 4,006 streets -- results from the imbalance between very high purchase prices (10,920 euros/sqm) and rental income that, while above average, cannot compensate the invested capital. Urban transformation has driven property values up far more rapidly than rents have been able to adjust.
What is the level of urban transformation in the area?
Via Gaetano de Castillia ranks fifth out of 4,006 streets for Urban Transformation, scoring 87.40 points -- more than four times the city median of 16.60. The immediate surroundings include Bosco Verticale, Torre UniCredit, Biblioteca degli Alberi Milano and 34 other completed projects, with 6 construction sites still active.