Estates need 80 points.
The highest appeal of boulevard is 52(straight line,if it is at the corner of a L-shape,the inner tile has 70,and at a cross even higher,that's the reason why "freeflow block" can work),52 points means it is just enough to lay down a empty elite house.
Mansions,manors and estates all have apppeal points of their own(mansion 3,3,2,2;manor 4,4,3,3,estate 6,6,5,5),so it is possible to setup a kind of chain reaction(in SenetEr's mixed block,3 of the 4 elite house in the middle need estates on the oppsite side of the street(boulevard),so it is a bit slow when evloving these houses(especailly when concerned with horses),but definately doable.
Olympian level makes no difference with elite houses,the evolving the devolving threshold are the same,but I noticed that at Olympian level,the damage increment is bigger than titan level,especially for those buildings at the corner of the block and had only one tile touching the avenue/boulevard(sometimes the overlay shows a red column for them).IMHO,for those "extreme style" blocks,maybe need one more mo.o.when doing at Olympian level(or put it on the outside road which has one-tile space to the building.
Oh,almost forget to mention:tax income varies according to the appealing points (average?)of houses,the difference could be 3%-10% so,have more appeal pints than neccessary is not completely a waste.
[This message has been edited by Plebus (edited 01-12-2001).]