set/24477_16_objects/2 matches the site

public static Set Lot_Estimated_Price()
{
    var lot = new Set()
        .WithContext()
        .WithId("https://linked.art/example/set/24477_16_objects/2")
        .WithLabel("Set of Objects for Lot 16")
        .WithClassifiedAs(Aat.Term("300411307", "Auction Lot"));

    lot.Dimension = [
        new MonetaryAmount
        {
            Value = 25000000,
            Currency = Aat.UsDollars.WithNotation("USD")
        }.WithClassifiedAs(Aat.Term("300417244", "Estimated Price"))
    ];

    return lot;
}

• Terms outside the registry The vocabulary registry holds only the terms linked.art itself publishes, so a dataset's own concepts, places and people are written with Aat.Term, Tgn.Place and Ulan.Person, giving the id and the label.

var set = new Set
{
    Context = ["https://linked.art/ns/v1/linked-art.json"],
    Id = "https://linked.art/example/set/24477_16_objects/2",
    Label = "Set of Objects for Lot 16",
    Dimension =
    [
        new MonetaryAmount
        {
            Value = 25000000,
            Currency = new Currency("http://vocab.getty.edu/aat/300411994", "US Dollars")
            {
                Notation = "USD",
            },
            ClassifiedAs = [Aat.Term("300417244", "Estimated Price")],
        },
    ],
    ClassifiedAs = [Aat.Term("300411307", "Auction Lot")],
};

Generated from the object the example builds: every property that is set, as object initialisers, with the vocabulary constants where a term is in the registry. The fluent helpers are a convenience, not a requirement; this form and the one as written produce the same JSON.