Best security camera system for small MF?

[Mary M.]

I am looking to install security cameras for my two buildings. One is 12 units the other 8. They are 4 stories each 

I want to install internally and also front of building etc 

I want a system that will record and save the data for at least a week. Have it be remote capable etc 

What systems do folks use or recommend? Professionally installed is what I think  I need as it needs to be hard wired etc (?)