accommodation angles angular apartment blocks apartments appearances architecture balconies balcony box-like building city complex contrast contrasting dark Designs detailed distinctive elements exterior external glass heights high high-rise light linear lines metal modern modernistic multi-storey multi-story plain quality short-term straight structures style supports tall tower towering units value views windows apartment-blocks art-deco condo condominium façade flats height heritage historic patterns protection safety sepia valuable boxed concrete highrise red shield shielded shielding squared structured abstract angled appearance architectural buildings contemporary corners edged edges framed frames geometric geometric-shapes gray grey patterned perspectives sharp sharp-cornered sharp-corners Singapore straight-up-and-down surface surfaces textured textures wall walls