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This paper presents a set of step‐wise regression models which can incorporate multiple factors in modelling the costs of office buildings. The models appeared to be more accurate than the traditional method.

The data were collected from historical office building projects, which were then, adjusted using the construction price index. The step‐wise regression was conducted to produce the linear cost models.

Seven RC office buildings and 11 steel office buildings in Hong Kong completed in different years were selected randomly to verify the accuracy of the regression models developed. The data of these buildings were not used in the development of the cost models. The result shows that the variability of percentage difference is ranging from −4.11 per cent (4.11 per cent underestimate) to +2.74 per cent (2.74 per cent overestimate) for RC office buildings. For steel office buildings, it ranges from −6.65 per cent (6.65 per cent underestimate) to +2.78 per cent (2.78 per cent overestimate).

This study presents a methodology that can be used in cost estimation of office buildings in Hong Kong at early stage of construction project. The regression cost models developed above are based on, in total, historical data of 30 completed office buildings in Hong Kong. The reliability of the cost models can be further improved by including more office buildings to develop the cost models. Furthermore, the application of cost modelling by regression analysis is not limited to office buildings. The same approach can be applied to residential and other non‐residential buildings as well. Regression cost modelling, with sufficient updating for new cost data available, can provide economic, quick and accurate cost estimation at early stage of construction projects. It will become rational guide supplementing judgmental forecast of cost advisors in near future.

Step‐wise regression procedure was applied to develop the cost models. Jackknife re‐sampling was carried out and both of the models show stability. Cross‐validation shows that the developed regression models performed satisfactorily. The paper considers that it can provide economic, quick and accurate cost estimation at the early stage of construction project. In addition, the approach of this study can be adopted to develop cost models of other types of buildings in other locations.

Commercial buildings, which include office buildings, are one of the three major energy-consuming sectors, alongside industrial and transportation sectors. The vast increase in the number of buildings is a positive sign of the rapid development of Malaysia. However, most Malaysian government office buildings tend to consume energy inefficiently due to lack of energy optimization. Most of the previous studies focused on the performance of green buildings in fulfilling the green development guidelines. As such, it is essential to study the energy performance of existing government office buildings that were constructed before most energy-efficient standards were implemented to mitigate energy wastage due to the lack of energy optimization. This study aims to analyse the energy performance of existing non-green Malaysian government office buildings and the factors that influence building energy consumption, as well as to evaluate the efficacy of the existing energy conservation measures.

This study was conducted by a literature review and case study. The chosen buildings are six government office building blocks located in Kuala Lumpur, the capital city of Malaysia. In this study, a literature review has been conducted on the common factors affecting energy consumption in office buildings. The energy consumption data of the buildings were collected to calculate the building energy intensity (BEI). The BEI was compared to the MS1525:2019 and GBI benchmarks to evaluate energy performance. SketchUp software was utilized to illustrate the solar radiation and sun path diagram of the case study buildings. Finally, recommendations were derived for retrofit strategies based on non-design factors and passive design factors.

In typical government office buildings, the air-conditioning system consumed the most energy at 65.5%, followed by lighting system at 22.6%, and the remaining 11.9% was contributed by office appliances. The energy performance of the case study buildings is considered as satisfactory as the BEI did not exceed the MS1525:2019 benchmark of 200 kWh/m2/year. The E Block recorded the highest BEI of 183.12 kWh/m2/year in 2020 due to its north-east orientation which is exposed to the most solar radiation. Besides, E Block consists of rooms that can accommodate large number of occupants. As such, non-design factors which include higher occupancy rate and higher cooling demand due to high outdoor temperature leads to higher energy consumption. By considering passive design features such as building orientation and building envelope thermal properties, energy consumption can be reduced significantly.

This study provided a comprehensive insight into the energy performance of Malaysian government office buildings, which were constructed before the energy-efficient standards being introduced. By calculating the BEI of six government office buildings, it is found that the energy performance of the case study buildings fulfils the MS1525 benchmark, and that all their BEIs are below 200 kWh/m2/year. Malaysia's hot and humid climate significantly affects a building's cooling load, and it is found the air-conditioning system is the major energy consumer of Malaysian government office buildings. This study discusses the efficacy of the energy-saving measures implemented in the case study buildings to optimize energy consumption. Recommendations were derived based on the non-design factors and passive design factors that affected the energy consumption of the case study building. It is envisioned that this study can provide practical strategies for retrofit interventions to reduce energy consumption in Malaysian office buildings as well as for office buildings that are in a similar climate.

Design teams have difficulties in assessing building carbon emissions at an early stage, as most building energy simulation tools require a detailed input of building design for estimation. The purpose of this paper is to develop a user-friendly regression model to estimate carbon emissions of the preliminary design of office buildings in the subtropics by way of example. Five sets of building design parameters, including building configuration, building envelope, design space conditions, building system configuration and occupant behaviour, are considered in this study.

Both EnergyPlus and Monte Carlo simulation were used to predict carbon emissions for different combinations of the design parameters. A total of 100,000 simulations were conducted to ensure a full range of simulation results. Based on the simulation results, a regression model was developed to estimate carbon emissions of office buildings based on preliminary design information.

The results show that occupant density, annual mean occupancy rate, equipment load, lighting load and chiller coefficient of performance are the top five influential parameters affecting building carbon emissions under the subtropics. Besides, the design parameters of ten office buildings were input into this user-friendly regression model for validation. The results show that the ranking of its simulated carbon emissions for these ten buildings is consistent with the original carbon emissions ranking.

With the use of this developed regression model, design teams can not only have a simple and quick estimation of carbon emissions based on the building design information at the conceptual stage but also explore design options by understanding the level of reduction in carbon emissions if a certain building design parameter is changed. The study also provides recommendations on building design to reduce carbon emissions of office buildings.

Limited research has been conducted to date to investigate how the change of building design affects carbon emissions in the subtropics where four distinct seasons lead to significant variations of outdoor temperature and relative humidity. Previous research also did not emphasise on the impact of high-rise office building designs (e.g. small building footprint, high window-to-wall ratio) on carbon emissions. This paper adds value by identifying the influential parameters affecting carbon emissions for a high-rise office building design and allows a handy estimate of building carbon emissions under the subtropical conditions. The same approach may be used for other meteorological conditions.

This paper aims to investigate the benefits derived from sustainable office buildings in People’s Republic of China (PRC) through their green features, with particular reference to energy efficiency.

A survey on operating costs, energy impacts, productivities from property managers and tenants of sustainable office buildings was conducted in Shenzhen, PRC. All survey data were collected from a portfolio of 12 sustainable office buildings and from 76 responses out of more than 400 tenants who had moved into these buildings from conventional office buildings.

Most tenants were concerned with sustainable operations, practices and policies. Some of them held that sustainable office buildings contribute to higher productivity and less sick time. These buildings typically consume less electricity and water, and have higher occupancy rates and rents.

There are only 40 sustainable office buildings in Shenzhen, and our study, albeit with proper methodology, with 12 sample buildings may not reflect entirely the attitudes of tenants and property managers of sustainable office buildings in Shenzhen. Advisably, future works can be carried out on a larger scale in other main cities of PRC to obtain a more comprehensive and precise evaluation on which strategic sustainable central/local government policies might be formulated.

The concept of facilities management on sustainable buildings, especially on their derived benefits, is relatively new in developing countries such as China. This study is one of the first attempts in this area. In addition, this paper also contributes to existing literature by looking into the green lease provisions and operating policies of these sustainable buildings.

The purpose of this paper is to investigate the role of spatial dependency in the construction of a price index for the transactions of whole office buildings. It examines transactions of office buildings over a 15-year period and addresses an under-researched area in investment property analysis.

The study examines data relating to transactions of all office buildings in the Melbourne (Australia) central business district between 2000 and 2015. The methodology uses a spatial weights matrix to construct a hedonic model, spatial error model, spatial lagged model and an office building transactional price index.

The findings confirm the existence of spatial dependency for the transactions of office buildings. In addition, incorporating the effect of spatial dependency by constructing spatial error and spatial lagged model improved the accuracy of the estimated transactional price index for office buildings.

These findings make an important contribution to the literature by highlighting the importance of the issue of spatial autocorrelation in the estimation of valuation models and price indexes for office buildings. Until now the focus has predominantly been on individual office units rather than whole office buildings, where the barrier has traditionally been access to comprehensive data. The analysis did not consider leasing details as this information is not accessible in the Australian market.

The research will assist stakeholders including valuers, investors and market regulators to improve their understanding of movements in the office property transactional market. The findings provide an insight into trends associated with the transfer of office buildings. It will assist future decisions about the location of a new office building developments in order to optimise their proximity to transport and other buildings.

The study will assist planners to ensure the location of office buildings are optimised from a social sustainability perspective. This equates to buildings located in close proximity to transport facilities and also supporting the development of office buildings in locations, which are associated with lower future risk.

The construction of an accurate and reliable property index is critically important for practitioners to understand the movement in both the property market and also in the broader economy. A substantial increase in whole office building acquisitions has been observed in recent years, especially after the 2007 Global Financial Crisis (Lizieri and Pain, 2014) although there has remained limited research undertaken in this area.

The built environment is a major source of carbon emissions. However, 80 per cent of the damage arises through the operational phase of a building’s life. Office buildings are the most significant building type in terms of emission-reduction potential. Yet, little research has been undertaken to examine the barriers faced by building operators in transitioning to a green operation of the office buildings in their care. This study aims to identify those barriers.

Building facilities managers with between 7 and 25 years’ experience in operating primarily Melbourne high-rise office buildings were interviewed. The sample was taken from LinkedIn connections, with ten agreeing to participate in semi-structured interviews – out of the 17 invitations sent out. Interview comments were recorded, coded and categorised to identify the barriers sought by this study.

Seven categories of barriers to effecting green operation of office buildings were extracted. These were financial, owner-related, tenant-related, technological, regulatory, architectural and stakeholder interest conflicts. Difficulties identifying green operation strategies that improved cost performance or return on investment of buildings was the major barrier.

Government, policymakers and facilities managers themselves have been struggling with how to catalyse a green transition in the operation of office buildings. By identifying the barriers standing in the way, this study provides a concrete point of departure from which remedial strategies and policies may be formulated and put into effect.

The uptake of green operation of office buildings has been extremely slow. Though barriers have been hypothesised in earlier works, this is the first study, to the best of the authors’ knowledge, that categorically identifies and tabulates the barriers that stand in the way of improving the green operational performance of office buildings, drawing on the direct knowledge of facilities experts.

This paper identifies the importance of key factors influencing the quality of CBD office buildings. An office building quality index (BQI) is constructed and its relationship with net rent assessed.

The importance of 30 property‐specific CBD office building attributes on the quality of CBD office buildings is assessed using a survey of property industry respondents. The analytical hierarchy process procedure is used to determine weights for each of these attributes to construct an office BQI.

Findings indicate that functionality (31.0 per cent), services (22.6 per cent), access and circulation (16.4 per cent), presentation (13.1 per cent), management (11.5 per cent) and amenities (5.4 per cent) are the order of importance in assessing office building quality. There was found to be a strong functional relationship between office building quality and net rent.

A better understanding of the factors influencing CBD office building quality is determined, with a more effective and practical office BQI developed for benchmarking purposes in property portfolios.

Importance of CBD office building attributes is determined and a new CBD office BQI is developed for practical implementation in the property industry.

The importance of adaptability in office buildings has increased during the past years, mostly due to factors like rapid change, both in private and public organisations, new and innovative work place design and growing environmental concerns about building redundancy.

The research design of the study presented here is a comparative case study, where recently built office buildings by 11. Norwegian real estate developers are assessed with regard to 16 different adaptability measures.

The study shows that office buildings built by owner‐occupiers are more adaptable than office buildings built by the group who develop property for renting and management, and considerably more than the office buildings built by the group who develop property for sale to investors. A short‐term perspective on property investment, i.e. that of the group who develop property for sale to investors, does not favour adaptability concerns. A long‐term perspective as well as a use‐value perspective on property investment, i.e. that of the owner‐occupier stakeholder group, on the other hand, do favour adaptability in office buildings.

Whether this research can help making buildings more adaptable, depends on whether the real estate customers, i.e. the users, they who pay for using the office building, understand the value of adaptability and are willing to pay the extra cost of adaptability. The building professions, including the real estate developers, claim that they know how to make office buildings adaptable.

The value of this paper may lie in demonstrating that this knowledge is not used in practice.

Green building construction was adopted as a strategy to reduce energy consumption and the overall impact of the built environment on our natural environment. However, in Malaysia, previous studies have reaffirmed that green office buildings consume a substantial amount of energy, compared to their counterparts in Singapore. Moreover, there is still a significant performance gap between predicted energy measurements and actual operational energy consumption of green office buildings in Malaysia, due to occupants’ behavioural discrepancies. Therefore, the purpose of this paper is to develop energy efficiency practices for occupants of green office buildings in Malaysia. The developed practices integrate technology, organisation policy, and occupants’ behavioural strategies, in order to reduce the energy consumption of green office buildings in Malaysia.

To achieve the research goal, a mixed (quantitative and qualitative) research method was used to collect data from the research population. In total, 53 respondents working in a green office building complex in Kuala Lumpur Malaysia were surveyed using a questionnaire. Additionally, three top management staff of the green office building and two Malaysian construction professionals were interviewed. The study adopted convenience sampling technique in selecting the research respondents. The data from the questionnaire were analysed using SPSS software (version 22) while the interview data were analysed via thematic content analysis.

The findings suggest that the integration of technological strategy (use of BIM tools, sustainable building materials, etc.); organisational strategy (develop, implement and evaluate action plans, use of monitor/control systems, etc.); and occupants behavioural strategy (training, incentives, occupants energy efficiency guide, etc.) will critically reduce energy consumption of green office buildings in Malaysia.

Based on the findings, energy efficiency practices are developed to guide occupants in reducing the energy consumption of green office buildings in Malaysia. This strategy will contribute to reducing the performance gap that exists between predicted energy and actual energy use of green office buildings in Malaysia. However, the developed energy efficiency practices need to be validated to ascertain its workability in the green office building context.

Green office buildings have recently taken on increased significance in institutional property portfolios in Australia and globally. The key issue from an institutional investor perspective is the assessment of whether green office buildings add value. Using an extensive portfolio of green office buildings, the purpose of this paper is to empirically assess the level of energy rating premiums in the property performance of green office buildings in Australia.

Using a portfolio of over 200 green office buildings in Australia benchmarked against a comparable portfolio of non-green office buildings, the level of energy rating premiums in the property performance of green office buildings in Australia is empirically evaluated. Hedonic regression analysis is used to account for differences between specific office buildings and to explicitly identify the “pure” green effect in identifying the level of energy rating premiums in several commercial property performance characteristics (e.g. office value, rent).

The empirical results show the added-value premium of the 5-star National Australian Built Environment Rating Scheme (NABERS) energy rating scheme and the Green Star scheme in the property performance of green office buildings in Australia, including office values and rents. Energy rating premiums for green office buildings are evident at the top energy ratings and energy rating discounts at the lower energy ratings. The added-value “top-end” premium of the 5-star vs 4-star NABERS energy rating category is clearly identified for the various property performance parameters, including office values and rents.

This paper empirically determines the presence of energy rating premiums at the top energy ratings in the performance of green office buildings, as well as energy rating discounts at the lower energy ratings. This clearly highlights the added value dimension of energy efficiency in green office buildings and the need for the major office property investors to prioritise the highest energy rating to facilitate additional property performance premiums. This will also see green office buildings become the norm as the market benchmark rather than non-green office buildings.

This paper highlights energy performance premiums for green office buildings. This fits into the context of sustainability in the property industry and the broader aspects of corporate social responsibility in the property industry.

This paper is the first published property research analysis on the detailed determination of energy rating premiums across the energy rating spectrum for green office buildings in Australia. Given the increased focus on energy efficiency and green office buildings, this research enables empirically validated and practical property investment decisions by office property investors regarding the importance of energy efficiency and green office buildings, and the priority to achieve the highest energy rating to maximise property performance premiums in office values and rents.