diff --git a/src/sdk/USStreetApi/Client.cs b/src/sdk/USStreetApi/Client.cs
index ae96d7a..fe8e710 100644
--- a/src/sdk/USStreetApi/Client.cs
+++ b/src/sdk/USStreetApi/Client.cs
@@ -1,4 +1,6 @@
-namespace SmartyStreets.USStreetApi
+using SmartyStreets.USReverseGeoApi;
+
+namespace SmartyStreets.USStreetApi
 {
 	using System;
 	using System.Collections.Generic;
@@ -66,9 +68,12 @@ private static void PopulateQueryString(Lookup address, Request request)
 			request.SetParameter("addressee", address.Addressee);
 			request.SetParameter("urbanization", address.Urbanization);
 			request.SetParameter("match", address.MatchStrategy);
-
-			if (address.MaxCandidates != 1)
+			
+			if (address.MaxCandidates != 1) 
 				request.SetParameter("candidates", address.MaxCandidates.ToString(CultureInfo.InvariantCulture));
+			
+			if (address.GetFormatString() != "default")
+				request.SetParameter("format", address.GetFormatString());
 		}
 
 		private static void AssignCandidatesToLookups(Batch batch, IEnumerable<Candidate> candidates)
diff --git a/src/sdk/USStreetApi/Lookup.cs b/src/sdk/USStreetApi/Lookup.cs
index 7bd93e2..a12ddcf 100644
--- a/src/sdk/USStreetApi/Lookup.cs
+++ b/src/sdk/USStreetApi/Lookup.cs
@@ -1,4 +1,6 @@
-namespace SmartyStreets.USStreetApi
+using System.Runtime.CompilerServices;
+
+namespace SmartyStreets.USStreetApi
 {
 	using System;
 	using System.Collections.Generic;
@@ -13,7 +15,13 @@ public class Lookup : ILookup
 		public const string ENHANCED = "enhanced";
 		public const string INVALID = "invalid";
 		public const string RANGE = "range"; // Deprecated
-
+		
+		public enum Format
+		{
+			Default,
+			ProjectUsa,
+		}
+		
 		public List<Candidate> Result { get; private set; }
 
         [DataMember(Name = "input_id")]
@@ -52,6 +60,9 @@ public class Lookup : ILookup
 		[DataMember(Name = "match")]
 		public string MatchStrategy { get; set; }
 
+		[DataMember(Name = "format")]
+		public Format OutputFormat { get; set; }
+		
 		public int MaxCandidates
 		{
 			get => this.maxCandidates;
@@ -85,5 +96,18 @@ public void AddToResult(Candidate newCandidate)
 		{
 			this.Result.Add(newCandidate);
 		}
+		
+		public string GetFormatString()
+		{
+			switch (this.OutputFormat)
+			{
+				case Format.Default:
+					return "default";
+				case Format.ProjectUsa:
+					return "project-usa";
+				default:
+					return "";
+			}
+		}
 	}
 }
\ No newline at end of file
diff --git a/src/tests/USStreetApi/ClientTests.cs b/src/tests/USStreetApi/ClientTests.cs
index 607c034..b041823 100644
--- a/src/tests/USStreetApi/ClientTests.cs
+++ b/src/tests/USStreetApi/ClientTests.cs
@@ -47,7 +47,35 @@ public void TestSendingSingleFullyPopulatedLookup()
 			Assert.AreEqual("?input_id=1234&street=1&street2=3&secondary=2&city=5&state=6&zipcode=7&" +
 			                "lastline=8&addressee=0&urbanization=4&match=enhanced&candidates=5", sender.Request.GetUrl());
 		}
+		
+		[Test]
+		public void TestSendingSingleFullyPopulatedLookupWithFormatOutput()
+		{
+			var sender = new RequestCapturingSender();
+			var serializer = new FakeSerializer(null);
+			var client = new Client(sender, serializer);
+			var lookup = new Lookup
+			{
+				InputId = "1234",
+				Addressee = "0",
+				Street = "1",
+				Secondary = "2",
+				Street2 = "3",
+				Urbanization = "4",
+				City = "5",
+				State = "6",
+				ZipCode = "7",
+				Lastline = "8",
+				MatchStrategy = "enhanced",
+				OutputFormat = Lookup.Format.ProjectUsa
+			};
+
+			client.Send(lookup);
 
+			Assert.AreEqual("?input_id=1234&street=1&street2=3&secondary=2&city=5&state=6&zipcode=7&" +
+			                "lastline=8&addressee=0&urbanization=4&match=enhanced&candidates=5&format=project-usa", sender.Request.GetUrl());
+		}
+		
 		#endregion
 
 		#region [ Batch Lookup ]