The same for extra improvements on the property. You can further reduce the gift portion and thereby increase the retained interest portion, by having a beneficiary pay for part of their interest. In this way, more of the asset passes outside of the gross estate. However, this approach is generally used to make the equities of several beneficiaries equal, such as when one of the beneficiaries is a child of a spouse or a friend of the family. This also allows the grantor to continue use and enjoyment of the property beyond the trust term.
Trusts serve many useful purposes.
However, the law of Trusts and Estates is a complex area which is constantly changing. Consulting with your legal and tax professional will help to ensure that the trust you establish provides the benefits you intend.