Affordable investment property with 4 residential units, 3FH + granny annexe on the edge of the forest

From private owner! Quiet and green location on the edge of the forest: former Trösler schoolhouse from around 1900 (probably 1908).
Charming, three-storey apartment building with potential for expansion, including a romantic little two-storey granny annexe from 1970.
The MFH is one half of a semi-detached house, from the street view there are 5 windows per floor, 3 of the windows, thus approx. 3/5 of the building width belong to the multi-family house offered here.

All residential units run on a central oil heating system (built in 2017).
The low price is due to the upcoming measures.
The roof should be re-roofed and insulated in line with the times. Since the top floor (approx. 80 m²) is currently not rented out, a renovation would be a good idea here; work has already begun on a toilet and new drainage system. The associated balcony was renewed approx. 8 years ago and is in very good condition.
The 1st floor (approx. 83 m²) is freshly renovated and rented, the photos are approx. 6 months old.
The ground floor (approx. 65 m²) is rented, for privacy reasons there are no photos here.
The 2-storey basement (sandstone, not dry) offers storage space and contains the heating system and the oil tank.
The existing electrical installation is 2-core, for stove connections and instantaneous water heater was partially modernized here.
A few windows in the main building are still single glazed with an upgrade glass frame from the outside.

The small house (approx. 49.5 m²) from the 70s was renovated in 2016, see photos from that time, here too there are no current photos due to the privacy of the tenant.
A completely new, insulated roof truss was built here in 2016, a heating pipe was laid from the main house, and the floor structures were renewed, insulated and sealed, as well as diffusion-open insulation of the rear wall to the slope.
A wood-burning stove provides additional coziness in winter.
The terrace is currently in a very poor condition and needs to be renewed, the photo shows an old state, as potential.

Quiet location in a side street, bus stop within walking distance, playground nearby, no noisy businesses or similar within earshot. Good cohesion of the residents (neighborhood help, street party etc).