I can help with the following: site selection, due diligence, design, permitting, and construction.

Something like that design may be up to a $1000 per rail section (meaning the one pictured would be 1 section).  

Where I live we have houses fall into the commercial designation after vacant for so long and they become very difficult to sell the prices drop VERY low. 

https://www.sherwin-williams.com/document/PDS/en/035777440230/Emerald, ProMar 400 and Harmony, same thing as above.https://www.sherwin-williams.com/architects-specifiers-designers/products/interior-paint-coatings/paint-coatings-interior#facet:&productBeginIndex:27&orderBy:&pageView:grid&minPrice:&maxPrice:&pageSize:9&

Design Build - Where the Architect/Contractor does the design and the construction.

As I understand it, this is a relatively new feature on MLS and I haven't used it yet.

You can also draw your own plans, but it can be a painful process for someone not familiar with all the code and design complexities that building departments like to have spelled out on a set of plans.

What features benefit you as investors?

Standard features that big box stores charge $2000-$5000 extra for. 

Airbnb will instantly boost your property in search when you have these features.6.