What type of restrictions should I look to avoid when searching for land to build on?

We were originally going to put our PB duplex on the market next spring but with the new SVR restrictions set to take place next July (barring court challenges and delays) we don't want to be on the market if/when a ton of investors start dumping their multifamily properties, so we'll be testing the waters and possibly listing it in October or November.We shall see.

I plan to execute a full campaign by the end of this year and hopefully secure my first investment deal.

Where we have restrictions is taking in 1031 money from investors or enabling investors in our LPs to 1031 to their own investments. 

(Not to mention, does the HOA allow rentals or have restrictions? 

@Craig Curelop is correct about Denver, but the area you are talking about is mostly Aurora, so there are no restrictions.

I had a lead come in off a direct mail campaign.

Assuming you want 30YF residential 1-4 unit financing, it's not going to get better than that, so just call around until you find a lender you like that does not have restrictive overlays. 

Some have restrictions how many units can be non-owner occupied at any time.Also check with your city/county tax assessor. 

Zoning can introduce restrictions or open up possibilities.