If the building would be built anyways using more destructive processes or materials, then perhaps. There’s no guarantee that the building would have been built though. Sure most would probably be built anyways, but at some point the different costs would affect the supply and demand at a macro level.

Nonetheless, it’s ignoring the entire carbon-sequestration system that the tree enables. What percentage of buildings are a net carbon-sink (including construction, use, maintenance and eventual demolition), or improve the naturally occurring carbon-sequestration process by merely existing? Any? I really don’t know. It’d be cool if we were constructing such buildings, but I doubt they’d be as efficient as just leaving old growth forests alone.