Update app.py

app.py

@@ -69,8 +69,8 @@ def main():
         
             #apply all filters 
             mask = (df_properties['building_sf'] >= min_size) & (df_properties['building_sf'] <= max_size) & (df_properties['months_since'] <= st.session_state['months_back'])
-            df_properties_filtered = df_properties[mask]
-            st.write("Number of Rows After Applying Filters : ", len(df_properties_filtered))
+            df_properties_cnt = df_properties[mask].copy()
+            st.write("Number of Rows After Applying Filters : ", len(df_properties_cnt))
     
     if st.button("Submit"):
         if selected_option == "":