Tri-Inspector/Runtime/Attributes/PropertySpaceAttribute.cs

using System;
using System.Diagnostics;

namespace TriInspector
{
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Method |
                    AttributeTargets.Class | AttributeTargets.Struct)]
    [Conditional("UNITY_EDITOR")]
    public sealed class PropertySpaceAttribute : Attribute
    {
        public float SpaceBefore { get; set; }
        public float SpaceAfter { get; set; }

        public PropertySpaceAttribute(float spaceBefore = 0, float spaceAfter = 0)
        {
            SpaceBefore = spaceBefore;
            SpaceAfter = spaceAfter;
        }
    }
}