It offers a great opportunity to learn the ins and outs of the industry while building a network. 

We made an aggressive offer quickly.

Since this is a rehab, you shouldn't have to worry about offering a builders warranty but here's some things I've become accustomed to doing to make the warranty, sale process and transaction process easier.  

A single property is simpler to manage, carries lower financial risk, and offers streamlined tax reporting but may generate taxable income sooner.

There are a lot of options with a 6 unit building, and I agree without more details that it will be hard to offer any specific advice. 

However the owner comes from corporate world and they started out doing deep dives into markets and moving Hedgefund type portfolios between large investors.. they then decided to offer there service to smaller turnkey type and one offs..

I recently learned that Fannie and Freddie offer financing that wasn't available to us for smaller purchases and I'd now like to pursue larger deals with this type of non-recourse financing. 

Many cost segregation study professionals will offer you a free quote on the cost of the cost seg study specific to your property as well as the potential tax savings.HOW LONG DOES A COST SEGREGATION STUDY TAKE?

What type of fund offers 12%?   

.: Quote from @Jefferey Eutsay: I'm considering making an offer on a 36-unit multi-family property.