DovidBT – best contact that I know of is CHAI – Comprehensive Housing Assistance, Inc. It started out years ago when the Park Heights area was starting to change, with the goal of keeping the community affordable for Orthodox Jewish families, and has grown steadily over the years as a resource for home owners, renters, and now seniors, helping seniors age in place. Upper Park Heights is a stable, racially mixed neighborhood of mostly Orthodox Jews and middle class African Americans, who cooperate to keep the community safe and welcoming.
CHAI is now an affiliate of the Associated Jewish Charities. The director is frum and the organization is basically oriented to frum families. There are also resources and listings for renters.
Their website is chaibaltimore.org and their phone is 410-500-5300. Their website has lots of information about the neighborhood and their services, and if you call/email they can give you referrals to other organizations in the area. Some of the staff (including one of the receptionists) are frum.
Good luck!