I have found 3 separate 4 plexs  in the Grand Rapids area 2 are off market and the other was just listed on the MLS so open game. 

I would suspect that the cost of construction materials and labor are going to be going up rapidly in your market place.

Check with the RPOA out of Grand Rapids. 

Witnessing the rapid rise in real estate values in Westchester County this year, we knew now was the time to sell. 

Prices can't continue at the rapid pace that it was on. 

However, this option also requires that they share their candy with other children who knock on the door and they will soon discover a rapidly diminishing supply of sugary sweets in their bucket.

Well...the Dayton Dragons baseball team has the most consistent sold out games of any sporting team in North America (startling fact), Warped Wing opened a second location, and a half dozen other breweries are now open in the city...Boston Stoker coffee is totally awesome and has several new locations (this is important because it's a key indicator for the successful revitalization of many cities...beer-food-coffee is key)...there is a river front development that is reminiscent of Columbus (which was awarded best on the country), there is big inner-city revitalization...I saw a developer by the name of Simms pre-sell 24 $500k "Brownstone" townhouses in the center of downtown (unheard of in Dayton)...there are 30 renovation projects going on downtown...and they now have a full time staff on the streets to keep the city clean...the population is on the increase for the first time since 1964....I mean this is pretty superficial, but it's every bit as important as economic indicators...there is a lot more to this...There are still "war zones" in abundance in Dayton and it's the Opiate Overdose capital of the USA...but getting better rapidly...just proceed with caution if you elect to invest there...a local subject matter expert is a must!

With all that said we have spent a ton of money for data looking at foreclosure rates, banking rates, where jobs are being created, where jobs are losing out, where schools are seeing rapid raises in enrollment, where governments at the local levels have been tax friendlier, where inventory on the open pubic markets are not meeting demand, and house transactions.

I'm in grand rapids MI and want to learn more about real estate investments and development.

your post is another reason to Hire a Property Manager, they know what to do and how to follow it through according to the law, the Laws are changing quite rapidly its hard to stay current, thats what a PM is for its there job to stay current.