NEED ASSISTANCE ANALYZING REHAB COST

[Genail Anderson]

I'm new to investing but was presented with a potential deal.  

Purchase price: $550,000

Home built in 1922, 1000 sq ft, Class A neighborhood in San Diego

ARV: $760,000

Known issues: unpermitted garage conversion, broken windows (vagrants may have been inside at some point)

Home has deferred maintenance concerns, and it is not possible to view inside to inspect further.  Are there any general  repairs that would typically need to be done or is it possible to determine what may need to be done by going to the city Building department to determine when the last permits were pulled?  I'm trying to get as close as possible to determining the amount of rehab necessary to garner a sales price of $760,000