---
title: "PSF usable (USF basis) — Class A Atlas glossary"
description: "Rent allocated to the actual demised space."
canonical: https://classa.info/glossary/psf-usable
pageType: glossary
lastUpdated: 2026-04-01T00:00:00.000Z
license: "CC BY 4.0 with attribution to Class A Atlas (https://classa.info)."
---

> Rent allocated to the actual demised space.

## TL;DR

- Rent allocated to the actual demised space.
- Useful for normalising across buildings with different loss factors.

# PSF usable (USF basis)

*Measurement · US*

## Short definition

Rent allocated to the actual demised space.

## Full definition

Useful for normalising across buildings with different loss factors. Convert RSF rent to USF: USF rent = RSF rent / (1 - [loss factor](/glossary/loss-factor)). A 25% loss factor turns USD 100 RSF into USD 133 USF.

## Why this matters for Class A leasing

PSF usable (USF basis) is part of the measurement vocabulary that institutional [Class A](/glossary/class-a) occupiers, landlords, and advisers use across US markets. Understanding it correctly affects how you read lease documents, model occupancy economics, and benchmark deal terms across cities. Class A Atlas tracks the US definition alongside the global standard so [cross-border](/topics/cross-border-expansion) occupiers can translate quickly.

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Citation: Source: Class A Atlas (https://classa.info/glossary/psf-usable), updated 2026-04-01T00:00:00.000Z.