1# RECORD 90a607088ae86bd68262b1b04abb70684edacc962# TITLE: Pricing the Daylight Comfort Frontier in Urban Housing: A Nonlinear Hedonic Reanalysis Framework for Turin Apartments3# YEAR: 2023.0 VENUE: Journal of Architectural and Planning Research DOI: 10.66033/japr2022-3024# AUTHORS: Adnan Asghar5# PAGES: 14 CANDIDATE TABLE PAGES (1-based): []6# ABSTRACT: Daylight is widely valued in residential decision-making, yet the economic literature still tends to treat its contribution7to housing value as a linear attribute or to proxy it with legacy compliance metrics. This article develops a benchmarkgrounded nonlinear hedonic framework to investigate whether the market rewards daylight quantity alone or, more8plausibly, a daylight comfort balance that combines useful illuminance, sunlight access, and manageable exposure. The9study is anchored in the Turin condominium sample reported by Loro et al., which includes 100 apartments modeled10through ClimateStudio and characterized by contextual, architectural, energy, and daylight variables. The empirical11motivation is specific and bounded: in the published ordinary least squares benchmark, estimated on 90 units and12checked on a 10-unit control sample, useful daylight illuminance achieved (UDI.A) and annual sunlight exposure (ASE)13were significant, whereas average daylight factor (DFm) and spatial daylight autonomy (sDA) were not, and the model14explained about 59% of variation in listing price per square meter. Building on that published pattern, the manuscript15strengthens the theoretical motivation, clarifies the interpretation of listing-price capitalization as a noncausal marketsignaling relation, and specifies a parsimonious semiparametric hedonic model with spline-based daylight terms and16restricted interaction effects among UDI.A, ASE, blinds-closed time, and vertical sky component. The contribution is17methodological and interpretive: a defensible comfort-frontier hypothesis, a transparent reanalysis protocol, and a18benchmark-based validation path for future microdata implementation. By making explicit why comfort-proximate19daylight metrics may matter more than legacy diffuse-sky indicators, the paper speaks directly to valuation practice,20climate-based daylight assessment, and performance-based housing design.212223===== PAGE 1 (score 5, numeric-paren 0, table-words 0, var-words 5) =====2425Journal of Architectural and Planning Research2637:3 (Summer, 2023)271728PRICING THE DAYLIGHT COMFORT FRONTIER IN URBAN HOUSING:29A NONLINEAR HEDONIC REANALYSIS FRAMEWORK FOR TURIN30APARTMENTS31Adnan Asghar32Daylight is widely valued in residential decision-making, yet the economic literature still tends to treat its contribution33to housing value as a linear attribute or to proxy it with legacy compliance metrics. This article develops a benchmark-34grounded nonlinear hedonic framework to investigate whether the market rewards daylight quantity alone or, more35plausibly, a daylight comfort balance that combines useful illuminance, sunlight access, and manageable exposure. The36study is anchored in the Turin condominium sample reported by Loro et al., which includes 100 apartments modeled37through ClimateStudio and characterized by contextual, architectural, energy, and daylight variables. The empirical38motivation is specific and bounded: in the published ordinary least squares benchmark, estimated on 90 units and39checked on a 10-unit control sample, useful daylight illuminance achieved (UDI.A) and annual sunlight exposure (ASE)40were significant, whereas average daylight factor (DFm) and spatial daylight autonomy (sDA) were not, and the model41explained about 59% of variation in listing price per square meter. Building on that published pattern, the manuscript42strengthens the theoretical motivation, clarifies the interpretation of listing-price capitalization as a noncausal market-43signaling relation, and specifies a parsimonious semiparametric hedonic model with spline-based daylight terms and44restricted interaction effects among UDI.A, ASE, blinds-closed time, and vertical sky component. The contribution is45methodological and interpretive: a defensible comfort-frontier hypothesis, a transparent reanalysis protocol, and a46benchmark-based validation path for future microdata implementation. By making explicit why comfort-proximate47daylight metrics may matter more than legacy diffuse-sky indicators, the paper speaks directly to valuation practice,48climate-based daylight assessment, and performance-based housing design.49© The author(s) 2023. This article is an open access article distributed under the terms and conditions of50the Creative Commons Attribution (CC BY 4.0) license (http://creativecommons.org/licenses/by/4.0/).51https://doi.org/10.66033/japr2022-30252