this only works on Project64 1.7 this happen to me while texting the obstacles that I edit in Toads Tool 64. I will release the short version of this hack without textures.

without textures: v1.0 (short)
with textures: v1.4 (short)
with the basement(without 3rd flor): v1.5
fully finished: v1.6

so keep waiting to summer for v1.0