Run on WindowsBC1?
Those hidden costs are what <pun>code</pun> inspectors hit you with after you are moved in and committed. Did they get you for the "'Access' Keys and Licenses2" yet?
Does the often touted/proverbial "running Hot and Cold" pipes work? What about the Garbage Collection? Is the Backend3 and Frontend4 well maintained? I am guessing you got a gaurantee to be "Bug-free", make sure you hold them to it! How is the Firewall looking? The backdoors are closed? Hoping that IP5 stack and escalation are very robust and built well, too. You also made sure there aren't any foundation "class" cracks right?
I hope the CEMENT is a good solid base for the BC1 house. You might want to look at some alternatives that are emmensely popular lately and quite robust too. Linoleux is an eXellent™ way to put older hardware, like your house, back into (re)production. It amazing what a few amateur and unorganized people6 can do when they put there heart into it. There are others, also. I can make sure your cielings are all "apache"d up, giving you a very nice looking site, it handles many different treatments as well. PHP7 very effective at increasing the beauty of the site as well, so you might want to think about using it.
I wish you luck in you long-term projects.
1 Bloated Cost
2 Key to the house and occupation permit
3 The yard behind the house
4 The yard/driveway in front of the house
5 Internal Progressive
6 As taken from a recent lawsuit against IBM.
7 aPache-ing Has Proven