Not only does it perhaps bring them future business but its also just a very motivating gesture.  

But for just saying "Hey Joe meet Sally, I think she might have something you might be interested in", I think if they bought you a beer or a lunch after they struck a deal, that'd be a nice gesture and about all I would expect if it were me.  

As a goodwill gesture you can order an exterminator package to calm them down. 

If someone is looking down, looking away,etc. with facial gestures as they talk that tends to not be a good sign.

However now that I am more of an investor seeking to buy property, my hope is they see this as an earnest gesture.

And i know that your only trying to do a nice gesture.

The lease did not start until April 30 at noon (I let the tenant move in on the 28th as it was a weekend and wanted to show a kind gesture).

People will argue of impending Armageddon if you don't slavishly follow your contract  but it's not true.It can be a way you choose to operate your business - most it's not how most businesses  operate (ever heard of the gesture of goodwill) and there is no real reason (no it will not necessarily get you in Fair Housing trouble) for a rental business to be an exception. 

If the property has landscaping in place make sure it is cleaned up then add fresh mulch and some potted plants in a complimentary color scheme to the house color scheme to the house.† Go for balance with some around a tree or spaced across the front of the house then some on either side of the front porch or door and one inside where you have people sign in.† You don't spend a lot of time, effort, or money but you get a very nice result.† Depending on the yard you might add some decorative wind chimes to the trees or bird houses or other cute extra to make people have a little "ah moment" that makes your property stick in their mind.The next area you want to address is creative marketing.† Invite all the neighborhood residents to an invitation only presale open house party.Have simple finger foods and if it is a neighborhood with many young children you might put a toy box with little gift bags for the children in the room most likely to be for a young child.† If the neighborhood has more tweens and teens you might set up a game system in one room that will stay with the house.† Many times a neighbor will know someone who would like to live in their neighborhood.When you do hold an open house go the extra mile to make it stand out.† Make your sign post at least 36†high so it stands above the rest.† You might also go to a party store and get a cardboard figure and put it behind the sign so it looks like it is holding it.† You could put individually† wrapped soaps in a pretty dish in the bathroom with a little complimentary sign.† Have snacks available, have a drawing for a prize, just use your imagination and have fun with it.† The goal is that people feel comfortable and want to live in this house.If you are a wholesaler the banks are one of your biggest competitors right now.You normally buy extremely low and sell low without doing a thing to the property.† In order to maximize your profits and keep a quick turn around right now you need to stand out from all the other distressed properties flooding the market.† Now is the time for the two hour rule.† As soon as you get the property clear as much junk out of the yard and clean as much of the interior as you can in two hours.† If you pay four people $50 each for two hours your property will be that much ahead of the other wholesale properties and that $200 you spent can make you a few extra thousand on the deal.† Perhaps you even throw in a $50 gas card for the buyer or a Home Depot gift card.† Small gestures can make a big difference during a soft market.Another strategy is to target a group with specific needs and create a plan for them.† One example is student housing.† In Atlanta, Home Park was for a long time a place where Georgia Tech students could rent cheap houses near the university.† When Atlantic Station was built it changed the area to a much more expensive and more owner occupied area.† There is still a need for reasonably priced student housing but the closest area to campus where that is available is not exactly where a mother would feel good about dropping their freshman student off.† In this case, the city wants to renew the area and developer incentives are available but you see brand new homes standing vacant and vandalized next to not so new homes boarded up.† You have multiple needs here, available properties but fear of trail blazing in a marginal neighborhood.† In this case, you could identify available properties and incentives then go to your local investment group or online investment group and do simultaneous investing.† If you were to get fifty investors to buy and rehab at least two homes each and you all do it at the same time you can turn a neighborhood around in a very short period of time.† If you could rehab one hundred homes in a ten block area all at the same time you will have made money, provided a needed commodity and helped the neighborhood residents all at once.† It is a win-win-win situation.Of course there are other groups such as artists that need low overhead and space to live and work.† They might not need hardwood floors throughout; they might be more interested in a large room with a utility sink, or a photo studio in a converted garage that you could do advertising photos of large objects in.Find out who needs what in your market area and find a way to provide it.† If you address needs while solving problems you can get ahead even in a soft market.

You could kick in $5K for the cleanup as a good will gesture.