Hi Hamlet
We are currently in the process of buying a property and the adjoining plot of land. Our solicitor advises that according to a new law, building permission must be applied for with two years of sale. Building must take place within three years from this point. For building permission, you need architects drawings and planning permission. There is obviously a cost for this.
The alternative is to merge the two plots into one Tapu. In our case , the cost for this would be around 6 to 8k lira. They can later be demerged, but at a similar sort of cost.
If it's a new law, it may not apply to you as I think it was enacted in 2012. You bought in 2011.
I would consult a solicitor.