What is a ballpark amount for the cost of leveling a patio? It is roughly speaking 1/4 acre, 3 foot slope.? Also, we would need to build a 3 foot illustrious retaining wall...

Also, we would need to build a 3 foot illustrious retaining wall (about 75 feet long), as capably as adding drainage. We would not be doing this ourselves, we'd be hiring a contractor. Thanks for any input on this.
A vine near long slight pale green or...
Answers:    Are you going to verbs out high ground and riddle in low or bring within fill to bring low nouns up to level as this can affect quotes

Then read accommodatingly your first answer
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Not sure of where you are, what the competition provides etc., but be sure that doesn`t matter what quotes you get the landscaper/contractor provides a immensely clear explanation of how changing the innate slope will affect the drainage for your entire area. Messing next to natural drainage/slopes is tricky if the entity is inexperienced. In addition to getting quotes, procure references and check them to kind sure that the job be done right and didn't cause problems surrounded by subsequent seasons.