Many human activities are carried out in buildings, suggesting that the contribution of buildings to global warming is significant. This study examines the awareness of property managers (estate surveyors and valuers) about the potential benefits of vertical greenery systems (VGSs) on buildings. The questionnaire for the study was administered online to property managers working with registered estate surveying and valuation firms operating in Lagos. On firm basis, a total of 282 property managers working for the firms were considered. Of this total, 127 responded to the questionnaire, but 121 (representing 42.9%) were of use in the analysis of data. The data were analyzed using the fuzzy synthetic evaluation method. The result showed that property managers were generally less aware, with an overall awareness level of 2.60. Further analysis showed that the property managers were less aware of the benefits of VGSs on buildings. The levels of awareness of the property managers about VGSs' environmental benefits, social benefits, and economic benefits are 2.65, 2.58, and 2.53 respectively. We conclude that an improvement in the level of awareness of the property managers would assist in the formulation of policies by the government towards the achievement of SDGs.