In this paper we experiment with an original format of a Choice Modelling questionnaire developed to capture preferences from respondents with different property right frame of references. The format includes both WTP and WTA choice alternatives for native vegetation management. It is well documented in the literature that WTP and WTA differ considerably when the property right frame of reference changes. Accounting for different property right regimes is important because it greatly improve policy assessment. It would indeed possible to determine the direction of change from the current policy. Would it be optimal to tighten a standard or loosen it?