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When it comes to a BO, the consumer should not see field is lazy loaded or not and it's better to present as any other property (without exposing methods accepting Func parameters)., I'd rather go with the second approach without having the public method SetAddress

Lazy<string> _address;

public string Address 
{ 
    get { return _address == null ? null : _address.Value; }
    set { _address = new Lazy<string>(() => value); }
}