@Minna Hu great questions! The most challenging is a combination of finding suitable land to build on with our strict criteria. Combined with working with cities. City officials are sometimes like a high school clique in these small towns that we go to and its tough to know if they will help you or not. We have gone to cities where they didn't seem that interested and then rolled out the red carpet once we moved further along. There are other cities that we went to that loved the project from the beginning but refuse to offer any support in terms of getting the deal done. One city wanted us to spend 500k to improve existing city infrastructure which was clearly the city's job. They think that developers are set to make a ton of money so they sometimes try to push responsibility off.
Top three mistakes: Not negotiating the utility rates with the city before starting. Pre leasing the units too early and the move in date was pushed back about 45 days because developer went over scheulde. Not building more units!
Sprinkler system greatly reduced insurance for us
hire an exterior designer to help with paint choices. I picked the colors and they didn't turn out like i thought it would to save couple thousand $$.
change design to decrease cost and increase efficiency.