Looking to get established in the Walled City of Cartagena

Hi. I am J-D.
I have lived abroad (as an Expat) most of my adult life, much of it in the US and also in Latin countries.
I know Medellin and Bogota but my heart is in Cartagena's walled city (I can't bring myself to much like Boca Grande... reminds me of Benidorm (Spain) and Panama City. I CAN stay in Miami, so I have not much need for that.
I live on a Ranch Style property in the Dominican Rep. in the North Coast most successful development and the DR is my fiscal domicile (no world wide taxing). I plan to stay less than 180 days/year in Colombia for tax reasons. I will most likely get a restored "Piso"/Apartment upstairs in an old building with stores below in the historic part of the walled city. I do understand it's not cheap.
But I will need to understand Condo laws and also find a reputed legal firm to consult to me in residency, real estate and general contract maters and represent me in some cases.
I am also looking for a reputed Real Estate Broker with deep connections (I understand Colombia MAY not have a US-like structure of "Brokers" and certified "Real Estate Agents".

I will, like I have in most other countries seek to build relationships mostly with local nationals, in this case Colombians, but will also build ties to productive and successful local Expats.
I am not interested in get rich quick schemes, "chicas", drinking parties and much less drugs and people who can't or won't speak Spanish, one of the languages I am fluent in speech and writing. English is a second language for me too.
It is my firm conviction based on my experiences that in order to only have a shot at a successful and save Expat experience, being fluent in the local language is key #1... then there are other things which are needed.
I should be back in Cartagena (currently in Spain) in Fall of this year.
I would love to meet people as described and hopefully being introduced to reputable professionals.

Thanks!... J-D.