Thanks guys!
90% of the modeling/texturing/modeling etc was done by me, even the foliage. There are similar models on internet, but I have choosen re-model everything, just to optimize the final result.
The walktrough is running at 80-100 fps on a Geforce 970. The lighting was baked inside UE4 and it took about 8 hours on a Dual-Xeon 2670 v3.
I spent two months because I had to learn, understand and develop by myself a lot of things. This was by far the most complex archviz job that I have ever done. If I start this project today, with pre-made things, I could finish it in 10-12 days.
I'm working in some video lessons using UE4 for architecture and I think I will finish it in december.