I can't give you guideline text verbatim but one might think that some effort at a reasonable clean-up of any construction debris, filling in of excavation holes, leveling of piled soils, a rough-grading creating some positive slope away from the foundation perimeter, and downspouts with extensions attached to any possible affixed gutters......such might be what most folks would consider the minimum of landscape. Ask yourself if there are SAFETY aspects to mention concerning any in-complete finished "landscape". Might there be any aspect which directly affects ABILITY TO RE-SELL if that needed to be done in the (near) future ? You say this is a "new" mfd. home so perhaps there are comments in the P & S agreement which spell out exactly what is supposed to be done concerning any landscape. Has a certificate been issued to the buyer for XXXX sq.ft. of turf-sod available as part of the sale if installed within a certain number of months after purchase, ie. sometime this spring or summer ? Others may be able to give you the textbook answer. Best wishes.