I'm not sure how BRT can take less space than LRT. $150M of the funds are for land expropriations.
Well most of Don Mills already has semi-dedicated bus lanes (carpool + bus lanes). So that $105 million would be spent on signal upgrades, upgraded bus shelters (VIVA-style), etc. There is also the option to do curbside cutouts, if you only want to do carpool/bus lanes.