Hi Daniel
I don't know very much about Bulgaria but here in Romania (right next to Bulgaria, in north - for those who didn't know
) the situation I think is pretty much the same.
There is a lot of confusion on the market, everyone is expecting that the prices will go up like in 2004-2006 period (when it was an 65% and 45% increase per year on all properties) but now the market is stalling, just because you can't sell an old communist apartment with 1200 euros per square meter because on this money you can buy an new apartment build in a better area.
There are many apartments put on sale here in Bucharest with 47.000 Euros (40-50 sq m) but very few buyers. Only in the very central area the price is rising. In fact, the prices are going down in some marginal places, the real value is decreasing because currency exchange ratio is decreasing in favor or leva(or RON in romania) and against the Euro.
The same apartment sold one year ago for 50.000 local curency (let's supose is equal to 50.000 euros -just to give you an example) now is sold with 47.000 local curency but 55.000 euros just because of the parity involved.
You have to be very carefull about that.
On the other hand, if the property is situated in a future development area, you can get more than 75.000 in a few years. But, as Tania said, I think there (as in my country) almoust all the land is "corrupted". Do not expect an 100% ROI in 2 years.
More chances or luck you might have not in Sofia but in remote places or towns. Tracy has some good points in the last message, but you have to have the courage and inspiration to go on that not so advertised place.
Best regards
Radu