Caution: asking planning dept may generate questions and permit requests.Have fun!

etc) America's troubled economy with 1/3 population permanently unemployed, many tenants get their landlord cited for violations (ie, any and all work without permit which nowadays thanks to DIYers, seems to me in this area at least, most every home has some level of work ie, DIY electrical work, decks, summer kitchens, etra beds/baths, etc for which a permit was never pulled.enter multi-level lease holdover! 

One issue is what the local authority will charge you for permitting and costs etc.

A quick $15k investment into a rehab house to turn $20k profit in 60 days, no permits.  

What are the laws on direct mail marketing in Sweeden, is that permitted?  

Sometimes it might take a few days more because of waiting for permit inspection, but that shouldn't be a problem.Honestly, I'm happy to find a property with a dead/damaged/missing furnace. 

Make sure the addition is permitted first.

My GC has stated that since he is the one pulling permits, i wont be allowed to do anything to the house since he is liable for anything that happens on-site. 

If time permits, consider visiting local investment clubs, you'll have an opportunity to meet other investors both new like yourself and seasoned.  

You may find some info by checking with the city's building planning department, ask them if any permits have been pulled on the property, otherwise trying to contact the last owner somehow might be another way.