How a High Desert projection should be built.

Start from what is permitted, not what is possible

In unincorporated County territory, occupancy is set from the bedroom count as verified against Assessor data and building records, capped at 12 occupants regardless, and limited further by approved on-site parking capacity. A projection built on a marketed sleeping capacity larger than the permitted one is not optimistic, it is wrong, and it is also unadvertisable: County rules require the advertisement to state the permitted maximum occupants and vehicles.

In Twentynine Palms the definition begins at a minimum of two consecutive nights, so a model that assumes one-night bookings is modelling something the City does not licence.

Model the season the park actually creates

The Park Service identifies October through May as the busy season, with springtime and holidays the busiest and the park able to get very crowded. Summer is not a soft version of that; it is a different market, shaped by heat the Park Service describes as a very serious safety risk and temperatures Visit California puts in triple digits. A flat seasonality curve applied across twelve months will be wrong in both directions.

What cannot honestly go in

• An average daily rate or occupancy figure attributed to "the market" without a citable published source. None exists publicly for this market that we can attribute.
• Revenue from a configuration the jurisdiction has not permitted.
• An assumption that a permit will be granted. In County territory the caps mean some properties are simply ineligible, and the permit only becomes effective after a neighbour comment window and an appeal period.
• Event or commercial-use income. County rules prohibit weddings, receptions, retreats, conferences, filming, photo shoots and parties without a separate permit.
• Any figure that survives unchanged when you change the address. If the number does not move between a Joshua Tree parcel and a Yucca Valley one, it is not a projection of your property.

The cost side deserves the same rigour

Cooling and heating load in a two-climate market, pool or spa servicing if applicable, water, exterior furniture replacement in sun and wind, annual permit renewal with reinspection, transient occupancy tax remitted locally rather than to the state, insurance, and the cost of a same-day maintenance response in summer. A projection that models revenue carefully and costs loosely is not a projection.

Nine questions to ask

1. Which jurisdiction did you assume, and did you confirm it from the parcel rather than the postal address?
2. What permitted occupancy did you model, and where does that number come from?
3. Does approved on-site parking support that occupancy?
4. Have you confirmed this parcel and this owner are eligible under the County permit caps?
5. What seasonality shape did you use, and what is it based on?
6. What did you assume about summer — discounting, longer stays, or a pause?
7. Which costs are estimates and which are quoted?
8. What happens to the number if the permit takes an extra quarter?
9. What would have to be true for this to be 20 per cent wrong?

The owner-use and amenity break-even worksheets in Owner Tools show their assumptions on the page rather than behind it. They are educational, not a quote. Property-specific figures live in the Owner Portal under its own permissions.