Renovating a Modern Home- what should I be aware before I buy?

I am in the process of evaluating the purchase of a 1955 modern home. It is a 4 sided structure with 60 degree angled outside walls built on a slab- with a sloping asphalt roof. We live in an area where there is NOT alot of modern homes, so when it went on the market we jumped. However, while we have refinished our French Provincial, and cleaned up a colonial in the past, we are finding that this is a whole new ballgame, so I thought I would post to your forum for any suggestions. The home is small, so we would need to put on a bedroom addition- thankfully that does not look to be a problem, however I just wanted to see if there is anything I should aware about in regards to adding onto such a structure. The house was NOT maintained, so I wanted to learn more about what I should be looking for, as I will be on a limited budget to get into the house -what with the addition, etc, and I am trying to be as realistic as possible on a budget moving forward to restore this beauty back to her 1955 self. Any resources or suggestions are highly appreciated, as we are new to this, and being in a historical town in PA, there is alot of barn restorers, but not many "modern" folks.  Thank You!

i agree with Greg.  another thing to note is that asphalt shingles really shouldn't be used on shallow pitches.  Some say 3:12 pitch minimum while i say 4:12 minimum.  shallow pitch = easier for water and wind driven rain to get underneath and start rotting the plywood under the shingles.  so if the sloping roof isn't very steep there could be some water damage surprises under there waiting for you.  if replacing it i'd consider a metal roof or EPDM.

my guess is that the windows (and frames) may not be insulated so if you do restore it 100% true to the original design, it may = custom (not off the shelf) windows which could = $$, but imo it's money well spent.

i live in SE PA (not far from doylestown if that's the town u r referring to) & u r right - a 1955 modern home is a rare & refreshing find.

good luck!