You are analyzing a Housing Prices Dataset and have a categorical variable for type which has 3 categories Multi-Family, Condo & Residential. You run a linear Regression with Price as the Dependent Variable and the dummy variables for Multi-family and Residential. You find that the coefficient of Multi-Family unit is negative. What is the most likely reason that this is the case?

Multi-family units are on average priced less than Condo's

Residential units are on average more expensive than Multi-family units

There is an error in the regression equation

There are possibly too few data points for Multi-family units

Not enough information has been provided