Depends...

这个工程要多少钱？

Sewer Lateral:
 
1 70 ft South Lateral
2 100 ft Lateral to City Sewer Main Line
3 120 ft North Lateral

How deep?

Over 4ft deep need supporting panels by OSHA regulations.  I am putting $1000/10ft, so total is 
 35000 (adding permit, cleanup, and equipment rental)

Roof:
 
1 20SQ Units 6 & 11
2 4SQ Sections of Unit 9
3 4SQ Section of Unit 7

Yours are mostly 1 story, low pitch. 28sq total 8k

 
Windows:
 
1 Unit 1 Bathroom Window
2 Unit 2 Living room window
3 Unit 6 Kitchen Window
4 Unit 6 Bedroom Window
5 Unit 7 Attic Crawl Space Window
6 Unit 7 Living room window
7 Unit 7 Upstairs South Bedroom Window
8 Unit 8 bedroom Window
9 Unit 8 Staircase Window
10 Unit 9 South Bedroom Window
11 Unit 10 Bathroom Window

11 windows, say 4k including patching wall and painting. 

Flooring:
 
1 Unit 1 Replaced entire unit flooring with Synthetic Floor
2 Unit 2 Replaced downstairs flooring with Vinyl 
3 Unit 3 Replaced carpet downstairs
4 Unit 4 Repalced carpet upstairs
5 Unit 5 Repalced carpet for entire unit
6 Unit 6 Repalced carpet for entire unit
7 Unit 6 Replaced Kitchen Vinyl Sheet with Tile
8 Unit 7 Repalced carpet for entire unit
9 Unit 9 Repalced carpet for entire unit
10 Unit 10 tiled the kitchen and Living room 
11 Unit 11 Repalced one bedroom carpet

$1 material + $ labor. Go figure... 

Paint:
 
1 Painted each unit （x11） once

Each 1 5 gallon roll over, $300 labor...

 
Bath:
 
1 Unit 3 new Toilet

200

2 Unit 6 Replace the Shower with bathtub

700

3 Unit 7 A new bathtub
 
400

Laundry:
 
1 Unit 1 A new hookup

300

2 Unit 7 Shed A new coin op Laundry outside Unit 7
 
900

Swamp Cooler:
 
What's that?

1 Unit 6 A new Cooler
 
Furnaces:
 
1 Unit 1 New Furnace
2 Unit 3 New Furnace
 

950 each

Water Heaters:
 
1 Unit 4 New Water Heater
2 Unit 7 New Water Heater
3 Unit 9 New Water Heater
4 Unit 10 New Water Heater
 
500 each

Plumbing:
 
1 Unit 6 New bathtub plumbing
2 Unit 7 Entire Bath Sewer Pipe
3 Unit 9 Iron Case Sewer Pipe replaced with PVC
 
Say total of 1200

Vanity:
 
1 About 2-3 new vanity

100 each.