Been working on enhancements to incorporate housing shortage (population/housing supply ratios), though the above indirectly reflects that. 

Landlords that are blatantly violating the law (slumlords, sexual harassment, violence, etc.). 

Hi my name Sandra R and I am new to the BP and upgraded to Pro to further enhance my knowledge on REI.

San Francisco appears to have them as well, although I'm uncertain if they're constructed differently.That is unfortunate about the high operating costs of those buildings as I am sure they are beautiful and it enhances the neighborhood to have them maintained and occupied.  

Picking their brain and learning the ropes will only further enhance your growth.  

Property Improvements: Keep your properties well-maintained and consider making strategic improvements that can enhance value.

I completed some "landscape enhancement" by adding a few inches of dirt and now I'm out of the flood zone.Frank

I have listed and sold a few investment properties, however, I am looking to link up with and learn from those that are more experienced in investments to enhance my professional and personal knowledge.

This is the DE wording in 4603(b)(3), the Delaware Fair Housing Act: (3) To make, print or publish, or cause to be made, printed or published any notice, statement or advertisement, with respect to the sale or rental of a dwelling that indicates any preference, limitation or discrimination based on race, color, national origin, religion, creed, sex, marital status, familial status, source of income, age, sexual orientation, gender identity or disability, or an intention to make any such preference, limitation or discrimination.

The only ones you read about in the paper are (a) Landlords that blatantly violate the law, or (b) Landlords physically assaulting or sexually harassing their Tenants.The best protection: know and obey the laws, treat your tenants honestly and fairly, and document everything.