"Are there any of the independent variables (not including the constant) that are statistically not significant at the 0.10 level or lower? If yes, drop them from the list of independent variables.... . Continue the process until all of the independent variables are significant at least at the 0.10 level or lower. "
Yes following variables are not significant (insignificant) as their significance values are more than 0.10
Number of bedrooms ( sig. = .214),
Lot size (sig. = .186),
Building conditions (sig. = .731).
You can remove these three independent variables from your model and re run the model with remaining significant variables.
"Are there any of the independent variables (not including the constant) that are statistically not significant...