Real estate back office system

Looking to create a software program that will manage all of the office functions of a real estate company. This includes an integrated accounting package. The best example of what I am after is located at www.lucerosummit.com. You will have to see the demo to see how it works. This may be out of my league as far as pricing is concerned but I want to see what programmers feel the cost of developing this package is. I am able to supply a CD with a similar type of program that allows a 30 day trial which features all of the functions I need. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Windows / MS Access?