  We revisit quantum state preparation of an oscillator by continuous linear
position measurement. Quite general analytical expressions are derived for the
conditioned state of the oscillator. Remarkably, we predict that quantum
squeezing is possible outside of both the backaction dominated and quantum
coherent oscillation regimes, relaxing experimental requirements even compared
to ground-state cooling. This provides a new way to generate non-classical
states of macroscopic mechanical oscillators, and opens the door to quantum
sensing and tests of quantum macroscopicity at room temperature.
