In spite of even quality post-construction cleaning that you can organize through your building contractor, there will always be some very fine drywall type dust contaminant suspended in the air within the premises. This dust will persist and continue to settle out for weeks after the post construction cleaning, creating possible problems with electronic equipment, aesthetics, health, etc.
BCS has access to post construction cleaners that will raise the benchmark for health reasons.
They use hospital-grade HEPA filtered vacuums to detail vacuum first. This will considerably reduce the airborne dust in the building. They clean mini blinds, furniture, beside and behind furniture, corners, edges, other nooks and crannies, and remote/hard to reach window ledges that are accessible. They damp wipe generally and detail/sanitize kitchenettes and bathrooms.