NULL

Call:
lm(formula = lmformula, data = spdata)

Residuals:
    Min      1Q  Median      3Q     Max 
-178137  -24036   -1617   20321  223062 

Coefficients:
              Estimate Std. Error t value Pr(>|t|)    
(Intercept) -156834.59   16991.35  -9.230  < 2e-16 ***
floorsz        1423.77      68.55  20.769  < 2e-16 ***
typedetch     32268.83   14647.32   2.203   0.0283 *  
unemploy     650502.47  124679.26   5.217 3.32e-07 ***
prof         349421.44   26271.11  13.301  < 2e-16 ***
---
Signif. codes:  0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’ 1

Residual standard error: 42950 on 311 degrees of freedom
Multiple R-squared:  0.6796,	Adjusted R-squared:  0.6755 
F-statistic: 164.9 on 4 and 311 DF,  p-value: < 2.2e-16